Complex sentence: GB Railways (legal name GB Railways Group plc), formed October 1996, was the parent of a number of train operating companys: the company operated the Anglia Railways rail franchise and launched Hull Trains and GB Railfreight.
Split into simpler sentences: GB Railways (legal name GB Railways Group plc) was a train operating company formed in October 1996. The company operated the Anglia Railways rail franchise and launched Hull Trains and GB Railfreight.