Complex sentence: At the end of the film Chevron bought patents and controlling interest in Ovonics, the advanced battery company featured in the film ostensibly to prevent modern NiMH batteries from being used in non-hybrid electric cars.
Split into simpler sentences: At the end of the film, Chevron bought patents and controlling interest in Ovonics, the advanced battery company featured in the film. Ostensibly to prevent modern NiMH batteries from being used in non-hybrid electric cars.