Complex sentence: It had fixed tricycle undercarriage, three vertical tail and rudder units (one central and two as tailplane endplates, reminiscent of the Miles Messenger; but a large fin area was required by the deep sided forward fuselage), and a pod and boom fuselage.
Split into simpler sentences: It had fixed tricycle undercarriage, three vertical tail and rudder units, one central and two as tailplane endplates, reminiscent of the Miles Messenger. A large fin area was required by the deep-sided forward fuselage, and a pod and boom fuselage.