Complex sentence: The North American Sabreliner (later sold as the Rockwell Sabreliner) is a mid-sized business jet developed by North American Aviation and was offered to the U.S. Air Force in response to their Utility Trainer Experimental (UTX) program.
Split into simpler sentences: The North American Sabreliner (later sold as the Rockwell Sabreliner) is a mid-sized business jet developed by North American Aviation. It was offered to the U.S. Air Force in response to their Utility Trainer Experimental (UTX) program.