Complex sentence: John Sen Inches Thomson and his brother, Andrew, were sealers and whalers in the waters surrounding Australia and New Zealand, and were partial owners in the schooner the "Friendship" and the "Bencleugh".
Split into simpler sentences: John Sen Inches Thomson and his brother, Andrew, were sealers and whalers in the waters surrounding Australia and New Zealand. The Thomson brothers were partial owners in the schooner the "Friendship" and the "Bencleugh".