Complex sentence: Sexual abuse by a family member is a form of incest, it is more common than other forms of sexual assault on a child, and can result in more serious and long-term psychological trauma, especially in the case of parental incest.
Split into simpler sentences: Sexual abuse by a family member is a form of incest. It is more common than other forms of sexual assault on a child and can result in more serious and long-term psychological trauma, especially in the case of parental incest.