Complex sentence: He founded the PRPA (Pacific Railroad Preservation Association) in 1975 to provide support for the preservation work and with the support of many individuals and Burlington Northern Railroad, the 700 returned to operation in 1990.
Split into simpler sentences: He founded the PRPA (Pacific Railroad Preservation Association) in 1975 to provide support for the preservation work. With the support of many individuals and Burlington Northern Railroad, the 700 returned to operation in 1990.