Complex sentence: In the early morning hours of April 18-19 1993, Joseph was ultimately killed by his mother who while the family was visiting relatives had claimed that her son was a troublemaker and had threatened to murder him.
Split into simpler sentences: In the early morning hours of April 18-19 1993, Joseph was ultimately killed by his mother. While the family was visiting relatives, she had claimed that her son was a troublemaker and had threatened to murder him.