Complex sentence: He lived for some time in London, wherein 1638 he married the daughter of an alderman; but in the following year he withdrew to Holland, and for some time was pastor of a small congregation of English merchants and refugees at Arnheim.
Split into simpler sentences: He lived for some time in London, where 1638 he married the daughter of an alderman. For some time was pastor of a small congregation of English merchants and refugees at Arnheim.