Complex sentence: Shortly after, Caitlin decided on spending some time over at the Naval Criminal Investigative Service, however, she was never actually in any episodes of the show "NCIS" or mentioned by any of the characters.
Split into simpler sentences: Shortly after, Caitlin decided to spend some time at the Naval Criminal Investigative Service. However, she was never actually in any episodes of the show "NCIS" or mentioned by any of the characters.