Complex sentence: He continued the sail until Marudu Bay in northwestern Borneo where he find out that piracy had going rampant, causing him to set a vision to suppress the activities and to carry a civilisation to the Malayan race.
Split into simpler sentences: He continued the sail until Marudu Bay in northwestern Borneo where he find out that piracy had going rampant. This leading him to set a vision to suppress the activities and to carry a civilisation to the Malayan race.