Complex sentence: Ryan received his Bachelor of Arts degree in 1969 from Cornell University and began his career as a systems analyst with Burroughs, then worked at Lawrence Livermore Lab on the first non-military extension of Arpanet, the precursor to the Internet.
Split into simpler sentences: Ryan received his Bachelor of Arts degree in 1969 from Cornell University. Then began his career as a systems analyst with Burroughs, then worked at Lawrence Livermore Lab on the first non-military extension of Arpanet, the precursor to the Internet.