Complex sentence: The USAF had originally envisioned ordering 750 ATFs at a cost of $26.2 billion, with production beginning in 1994; however, the 1990 Major Aircraft Review led by Secretary of Defense Dick Cheney altered the plan to 648 aircraft beginning in 1996.
Split into simpler sentences: The USAF had originally envisioned ordering 750 ATFs at a cost of $26.2 billion, with production beginning in 1994. The 1990 Major Aircraft Review led by Secretary of Defense Dick Cheney reduced the number to 648 aircraft beginning in 1996.