This is an excerpt from a book:
"Overlapping with this distinction is that between its use as a first language, the primary language of the speaker, and an additional language."
I can't figure out its subject and complement.
Could you tell me, please?
"that" means "the distinction". ] and an additional language is overlapping with this distinction.
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"that" means "the distinction". The sentence is also inverted, so the meaning is:
The distinction between its use as a first language [...] and an additional language is overlapping with this distinction.