Complex sentence: When she was fifteen years old and out seeing the movie "Titanic" with friends, a movie Kensi considers to be her own favourite, her father was murdered with his body being so unrecognizable that he had to be identified through the use of dental records.
Split into simpler sentences: When she was fifteen years old and out seeing the movie "Titanic" with friends, a movie Kensi considers to be her own favourite, her father was murdered. His body was so unrecognizable that he had to be identified through the use of dental records.