Complex sentence: For the ten following years he was engaged in writing and preparing books for the American Sunday-School Union, he was licensed to preach in 1840, took charge of a Congregational church in West Roxbury, Massachusetts, and subsequently held other pastorates.
Split into simpler sentences: For the ten following years he was engaged in writing and preparing books for the American Sunday School Union. He was licensed to preach in 1840, took charge of a Congregational church in West Roxbury, Massachusetts, and subsequently held other pastorates.