Complex sentence: Sergey was a chief petty officer aboard the USS Intrepid who found and adopted Worf after his ship was sent to aid the Klingons after the Khitomer massacre in 2346.
Split into simpler sentences: Sergey was a chief petty officer aboard the USS Intrepid. Sergey found and adopted Worf after his ship was sent to aid the Klingons after the Khitomer massacre in 2346.