Complex sentence: In addition to the use of a twisted rubber motor driving a pusher propeller, this machine introduced two important principles: the wings were angled upwards (dihedral), and the rear-mounted horizontal stabiliser was set at a smaller angle of incidence than the wings.
Split into simpler sentences: In addition to the use of a twisted rubber motor driving a pusher propeller, this machine introduced two important ideas. The wings were angled upwards (dihedral), and the rear-mounted horizontal stabiliser was set at a smaller angle of incidence than the wings.