Complex sentence: This legal argument was made in Gottschalk v. Benson in Benson's brief, and the government responded in its brief that this amounted to asserting that inserting a new piano roll into an existing player piano converted the old player piano into a new player piano.
Split into simpler sentences: This legal argument was made in Gottschalk v. Benson in Benson's brief. The the government then responded in its brief that this amounted to asserting that inserting a new piano roll into an existing player piano converted the old player piano into a new player piano.