In 2019 the company saw a strong uptake of its flagship OnePlus 7- series regaining the top spot back after falling behind Samsung in 2018.
Is the bold phrase a participial phrase or an object complement?
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In 2019 the company saw a strong uptake of its flagship OnePlus 7- series, [regaining the top spot
backafter falling behind Samsung in 2018].*
No: object complements consist of noun phrases or adjective phrases, but not clauses.
The bracketed gerund-participial clause is an adjunct, an optional item in clause structure.
Here, the adjunct has a resultative interpretation.
Incidentally, the word "back" is redundant and a comma after "series" is preferable, as shown.