Complex sentence: A Source Book on Black Films, page 39 George P. Johnson completed 37 years as a postal employee and compiled an extensive collection of information pertaining to blacks in the movie business, now in the UCLA Research Library.
Split into simpler sentences: A Source Book on Black Films, page 39 George P. Johnson completed 37 years as a postal employee. He compiled an extensive collection related to blacks in the movie business, which is now held by the UCLA Research Library.