Complex sentence: El Indio informs his gang that Manco and Mortimer "got away", and sends the gang in pursuit, intending to kill off his gang and Manco and Mortimer while he and Nino take all the loot for themselves.
Split into simpler sentences: El Indio informs his gang that Manco and Mortimer "got away", and sends the gang in pursuit. He intends to kill off his gang and Manco and Mortimer, while he and Nino take all the loot for themselves.