Complex sentence: Prior to 1869, the south end of Church Street was at Fulton Street, three blocks north of Trinity Place, then over several years a connection was cut through those blocks, both streets were widened, and Trinity Place was extended south to Morris Street.
Split into simpler sentences: Prior to 1869, the south end of Church Street was at Fulton Street, three blocks north of Trinity Place. Then over several years a connection was cut through those blocks, both streets were widened, and Trinity Place was extended south to Morris Street.