Complex sentence: That commitment proved to be impractical, given consumer preference for heavy towing capacity and large, powerful engines in their trucks; the company announced in 2003 that competitive market conditions and technological and cost challenges would prevent it from achieving the goal.
Split into simpler sentences: That commitment proved to be impractical, given consumer preference for heavy towing capacity, and large powerful engines in their trucks. The company then announced in 2003 that competitive market conditions and technological and cost challenges would prevent it from achieving the goal.