The Functional Groups included in the Operating Model seek to build stronger organizations across the globe

"by strengthening the reporting line relationship across these country operations and into our global functions" 是前半句的手段/方式，而不是目的，意思哦是："by strengthening the reporting line relationship 1）across these country operations and 2）into our global functions"
1）通过加强在这些国家的经营系统（these country operations）中的汇报线路关系、2）并通过加强这些国家对于我们的全球职能部门的汇报线路关系

这种运营模型中所包括的职能团队1）通过加强在这些国家的经营系统（these country operations）中的汇报线路关系并 2）通过加强这些国家对于我们的全球职能部门的汇报线路关系，来构建更为强大的组织。

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Note added at 4 days (2017-11-27 21:49:39 GMT)
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“across these country operations” 和 "into our global functions" 是并列的，它们都是strengthening the reporting line relationship的方位状语。