Complex sentence: Onslow saw his role to be the protection and defense of Parliament in the tradition established by the Glorious Revolution, and insisted on the rigid and detailed observation of parliamentary forms and procedure, which he viewed as a protection to independent MPs.
Split into simpler sentences: Onslow saw his role to be the protection and defense of Parliament in the tradition established by the Glorious Revolution. He insisted on rigidly observing parliamentary forms and procedure, which he viewed as a protection to independent MPs.