Complex sentence: Serrão departed in the first expedition sent to find the "Spice Islands" in the Moluccas, where he remained, having married a woman from Amboina and becoming a military advisor to the Sultan of Ternate, Bayan Sirrullah.
Split into simpler sentences: Serrão departed in the first expedition sent to find the "Spice Islands" in the Moluccas, where he remained. He married a woman from Amboina and became a military advisor to the Sultan of Ternate, Bayan Sirrullah.