Complex sentence: Its completion was delayed because of a dispute over patent rights between Eckert and Mauchly and the University of Pennsylvania, resulting in Eckert and Mauchly's resignation and departure to form the Eckert-Mauchly Computer Corporation and taking most of the senior engineers with them.
Split into simpler sentences: Its completion was delayed because of a dispute over patent rights between Eckert & Mauchly and the University of Pennsylvania. This resulted in Eckert and Mauchly leaving to form the Eckert-Mauchly Computer Corporation and taking most of the senior engineers with them.