Complex sentence: The French missionary Raymond Breton, who arrived in the Lesser Antilles in 1635, and lived on Guadeloupe and Dominica until 1653, took ethnographic and linguistic notes of the native peoples of these islands, including St Vincent which he visited briefly.
Split into simpler sentences: The French missionary Raymond Breton arrived in the Lesser Antilles in 1635, and lived on Guadeloupe and Dominica until 1653. He took ethnographic and linguistic notes on the native peoples of these islands, including St Vincent, which he visited briefly.