Complex sentence: Passenger service had ceased in the 1930s, and regular freight service ended in the late 1970s, which Analy High School students documented in the 1979 video, Our Train Down Main: a History of the Petaluma and Santa Rosa Railroad.
Split into simpler sentences: Passenger service had ceased in the 1930s, and regular freight service ended in the late 1970s. This was documented by Analy High School students in a 1979 video, Our Train Down Main: a History of the Petaluma and Santa Rosa Railroad.