Complex sentence: However, the company then decided that the post-war market for small commuter autogyros was too limited to proceed, so the SE-700A did not fly and a proposed production series of four SE-702s or 700Bs were not begun.
Split into simpler sentences: However, the company then decided that the post-war market for small commuter autogyros was too limited to proceed. Thus the SE-700A did not fly and a proposed production series of four SE-702s or 700Bs were not begun.