Complex sentence: In 1731, General Ignacio Iriberri lead a force of 1000 to Jolo and captured it after a lengthy siege, but the Spaniards left after a few days.
Split into simpler sentences: In 1731, General Ignacio Iriberri lead a force of 1000 to Jolo and captured it after a lengthy siege. But the Spaniards left after a few days.