Complex sentence: On his trip to Batavia on the frigate "Adriana", he practiced his knowledge of the Dutch language and rapidly learned Malay, and during the long trip, von Siebold started a collection of marine fauna.
Split into simpler sentences: On his trip to Batavia on the frigate "Adriana", he practiced his knowledge of the Dutch language and rapidly learned Malay. During the long trip, von Siebold started a collection of marine fauna.