Complex sentence: The Lockheed Martin X- 55 Advanced Composite Cargo Aircraft (ACCA) is an experimental twin jet engined transport aircraft which might demonstrate new cargo-carrier capabilities using advanced composites.
Split into simpler sentences: The Lockheed Martin X- 55 Advanced Composite Cargo Aircraft (ACCA) is an experimental twin jet engined transport aircraft. Its purpose is to demonstrate new cargo-carrier capabilities using advanced composites.