Complex sentence: The existence of the recordings was known by Jennings'wife, Jessi Colter and his son, Shooter Jennings, who were not comfortable with marketing Jennings' image after his death, feeling that they would "capitalize" on it.
Split into simpler sentences: The existence of the recordings was known by Jennings'wife, Jessi Colter and his son, Shooter Jennings. The family was not comfortable with marketing Jennings' image after his death, feeling that they would "capitalize" on it.