Complex sentence: He worked tirelessly to help homeless youth in New York City and founded the Mission of the Immaculate Virgin in Manhattan in 1871, it has been on its current site in the Pleasant Plains section of Staten Island since 1883.
Split into simpler sentences: He worked tirelessly to help homeless youth in New York City and founded the Mission of the Immaculate Virgin in Manhattan in 1871. The Mission of the Immaculate Virgin has been on its current site in the Pleasant Plains section of Staten Island since 1883.