Complex sentence: Despite support from his family, Renton is desperate for a more substantial high and escapes to his drug dealer's flat, where he nearly dies of an overdose, and his dealer sends him to hospital in a taxicab.
Split into simpler sentences: Despite support from his family, Renton is desperate for a more substantial high and escapes to his drug dealer's flat. He nearly dies of an overdose, and his dealer sends him to hospital in a taxicab.