Complex sentence: Maraynes also spent several years at ABC's 20/20, where he served as both producer and senior investigative producer, generating groundbreaking investigations into many pressing social issues, such as hotel security, the state of the mentally ill in prisons, and crime in nursing homes.
Split into simpler sentences: Maraynes also spent several years at ABC's 20/20, where he served as both producer and senior investigative producer. His groundbreaking reports at ABC included first-time network investigations into hotel security, the mentally ill in jails, and crime in nursing homes.