Complex sentence: The Rubis had a tube-framed, streamlined pod, containing a pair of side-by-seats in an oval, open cockpit which extended just aft of the trailing edge and also formed an integral part of the undercarriage structure.
Split into simpler sentences: The Rubis had a tube-framed, streamlined pod, containing a pair of side-by-seats in an oval, open cockpit which extended just aft of the trailing edge. The pod also formed an integral part of the undercarriage structure.