Complex sentence: Billy escapes from jail and hops a ride on a train, where he finds a guitar which reads "This Machine kills Fascists": the same guitar that Woody Guthrie played at the start of the film.
Split into simpler sentences: Billy escapes from jail, and hops a ride on a train. Billy finds a guitar on the train that reads "This Machine kills Fascists", the same guitar that Woody Guthrie played at the beginning of the film.