Complex sentence: He had no right to prevent a divorce by one of his children, and although able to deny the right to marriage by refusing a prospective son or daughter inlaw he could not legally force his children into marriage.
Split into simpler sentences: He had no right to prevent a divorce by one of his children. Though a father could to deny the right to marriage by refusing a prospective son-or daughter-in-law, he could not legally force his children into marriage.