Complex sentence: He was in every sense a missionary, travelling from place to place wherever there were Catholics, and stopping wherever night overtook him; he remained in the state until 1854 and died at New York in 1870.
Split into simpler sentences: He was in every sense a missionary, travelling from place to place wherever there were Catholics, and stopping wherever night overtook him. He remained in the state until 1854 and died at New York in 1870.