Complex sentence: UTC Aerospace Systems is one of the world's largest suppliers of technologically advanced aerospace and defense products; designing, manufacturing and servicing systems and components and providing integrated solutions for commercial, regional, business and military aircraft, helicopters and other platforms.
Split into simpler sentences: UTC Aerospace Systems is one of the world's largest suppliers of aerospace and defense products. They are engaged in designing, manufacturing and servicing systems and components for commercial, regional, business and military aircraft, helicopters and other platforms.