Complex sentence: When he got out of prison, Jo (Maurice Biraud) finds out that his love Rocky (Mireille Darc) was cheating on him with Jockey Jack (Louis de Funès) to get his revenge he sends his man "pom chips" to kill Jockey.
Split into simpler sentences: When he got out of prison, Jo (Maurice Biraud) finds out that his love "Rocky" (Mireille Darc) was cheating on him with Jockey Jack (Louis de Funès). To get his revenge he sends his man "Pommes-Chips" to kill Jockey.