Complex sentence: Hindustan Motors Limited (HM), India's pioneering automobile manufacturing company and flagship company of the C.K. Birla Group, was established just before Indian independence, in 1942 by B.M. Birla.
Split into simpler sentences: Hindustan Motors Limited (HM), part of the Birla group was a India's pioneering automobile manufacturing company and later a flagship company of the C.K. Birla Group. The company was established just before Indian independence, in 1942 by B.M. Birla.