Complex sentence: The senior Morris was a computer scientist at Bell Labs, where he helped design Multics and Unix, and later became the chief scientist at the National Computer Security Center, a division of the National Security Agency (NSA).
Split into simpler sentences: The senior Morris was a computer scientist at Bell Labs, where he helped design Multics and Unix. He later became the chief scientist at the National Computer Security Center, a division of the National Security Agency (NSA).