Complex sentence: In 1923, Jacobs sold it to John D. Hertz who made it a subsidiary of his Yellow Truck and Coach Manufacturing Company and renamed it "Hertz Drive-Ur-Self System".
Split into simpler sentences: In 1923, Jacobs sold it to John D. Hertz when it became a subsidiary of the Yellow Truck and Coach Manufacturing Company. Hertz renamed it the "Hertz Drive-Ur-Self System".