Complex sentence: Starting in 1922, many Bugatti engines used three valves per cylinder actuated by a single overhead camshaft (SOHC) and multi-valve engines continued to be popular in racing and sports engines.
Split into simpler sentences: Starting in 1922, many Bugatti engines used three valves per cylinder actuated by a single overhead camshaft (SOHC). Multi-valve engines continued to be popular in racing and sports engines.