French term
Naissent alors
Naissent alors des images aux couleurs éclatantes, qui de façon détaillée ou plus abstraite, reflètent les sentiments et les émotions liées au vécu de l'artiste.
Naissent alors les ghettos : Harlem à New York, le South Side à Chicago où, malgré des conditions de vie très dures, la culture afro-américaine se réinvente à travers le jazz et la littérature.
Naissent alors des compositions chromatiques saisissantes, alliant magistralement fureur et finesse, noirceur et acidité.
| 4 +5 | Thus, they emerge, come into being, ... |
Helen Shiner
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| 4 +1 | Then came / Then come |
Carol Gullidge
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| 3 | so then are created some/the... |
Barbara Cochran, MFA
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Non-PRO (1): Carol Gullidge
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Proposed translations
France
Arts/Academic translator - Art historian
Native in: English 
Works in: German to English, French to English
Thus, they emerge, come into being, ...
There are various contexts here, all dependent on what precedes the sentences in question.
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Elisabeth Gootjes
9 mins
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Thanks, Elisabeth
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katsy
28 mins
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Thanks, katsy
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writeaway
3 hrs
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Thanks, writeaway
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Charles Davis
: All excellent options. The phrasing, as you say, needs to be tailored to each case and preferably varied. Agree with katsy that the subject really has to come first. "Alors" could be temporal, in principle: "then". Whole context needed to decide that.
4 hrs
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Thanks, Charles. Yes, I reduced the various subjects to ‘they’ in my suggestion and it does, indeed, come first. ‘Thus’ sits happily where it is. ‘Then’ may be placed elsewhere if the cadence of the sentence requires it.
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Rachel Fell
13 hrs
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Thanks, Rachel
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United States
Laudable Lady Linguist
Native in: English 
Works in: Spanish to English, French to English, English to Spanish, and 3 more.
so then are created some/the...
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Note added at 12 mins (2018-11-23 18:13:08 GMT)
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http://context.reverso.net/translation/french-english/naître
United Kingdom
poetically precise prose with... panache
Native in: English
Works in: French to English, Spanish to English, English
Then came / Then come
Then came/come the ghettos...
I'm assuming here that the source texts are written in the Historic Present tense, as is so often the case when narrating historical events, but more so in French than in English. My personal preference is to turn it into a past tense in English, although our use of the historic present seems to becoming more and more frequent, especially in academic texts or documentaries. A lot depends on the register of the each particular text
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Charles Davis
: This could well be the sense of "alors". On the historic present: are you finding it a lot in academic texts? I have seen the odd example, but it seems deplorable to me. It's OK in journalism, but the immediacy it lends is essentially cheap, in my opinion
2 hrs
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Thanks Charles!... The historic present is used quite frequently in Radio-4 documentaries by Melvyn Bragg and his panelists. I have to say it makes me squirm somewhat, but the programmes are usually otherwise riveting!
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Discussion
Worth entering an answer.