Complex sentence: Stroh's had taken on a heavy debt burden to finance the Schlitz acquisition, but found itself unable to compete nationally with the likes of Anheuser-Busch, Miller Brewing Company, and Coors Brewing Company.
Split into simpler sentences: Stroh's had taken on a heavy debt burden to finance the Schlitz acquisition. But it then found itself unable to compete nationally with the likes of Anheuser-Busch, Miller Brewing Company, and Coors Brewing Company.