Complex sentence: Introduced in' as an unrevealed type of Infinity Stone (Presumed the Reality Stone) in a liquid-esqe form, it is entrusted to the Collector at the end of that film.
Split into simpler sentences: Introduced in' as an unrevealed type of Infinity Stone (Presumed the Reality Stone) in a liquid-esqe form. It is entrusted to the Collector at the end of that film.