Complex sentence: Nick used the affair to numb his emotions after his daughter's tragic death, and although he returned to his wife Sharon Newman (Sharon Case), Phyllis becomes pregnant and in unsure if Nick or Jack is the father.
Split into simpler sentences: Nick used the affair to numb his emotions after his daughter's tragic death, having been married to Sharon Newman (Sharon Case). A love triangle forms between the three characters, and while Nick initially returns to Sharon, Phyllis becomes pregnant and in unsure if Nick or Jack is the father.