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How about introducing the 1st person narrations as excerpts from the narrator's diary? You could write something like "xxxxx's diary. 6/8/2017: ..." and then write the chapter in 3rd person narration
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/28577 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/