Complex sentence: Rather than focusing on Brandon's early life and background, the screenplay was subsequently modified to be closer to Peirce's vision, which focused the majority of the film on the relationship between Brandon and girlfriend Lana Tisdel and the events that led to Brandon's murder.
Split into simpler sentences: Rather than focusing on Brandon's early life and background, the screenplay was later modified to be closer to Peirce's vision. The new script focused mostly on the relationship between Brandon and girlfriend Lana Tisdel, and the events that led to Brandon's murder.