Complex sentence: He admits to Liz that he has fallen in love with Elisa, after spending time together, though, when he gets his tests results, which come back negative, he has second thoughts on Elisa.
Split into simpler sentences: He admits to Liz that he has fallen in love with Elisa, after spending time together. Though, when he gets his tests results, which come back negative, he has second thoughts on Elisa.