Complex sentence: In 1901 the company's locomotive division was merged with seven other manufacturing firms to form American Locomotive Company (ALCO); the rest of the company became part of Allis-Chalmers.
Split into simpler sentences: In 1901 the company's locomotive division was merged with seven other manufacturing firms to form American Locomotive Company (ALCO). Whereas the rest of the company became part of Allis-Chalmers.