Complex sentence: It was directed by Bud Yorkin, written by Frank Waldman and Tom Waldman and starred Alan Arkin, who replaced Peter Sellers, who had declined to return for the lead role of Inspector Jacques Clouseau.
Split into simpler sentences: It was directed by Bud Yorkin, written by Frank Waldman and Tom Waldman and starred Alan Arkin, who replaced Peter Sellers. Sellers had declined to return for the lead role of Inspector Jacques Clouseau.