Complex sentence: Ortiz-Magro started dating his on/off girlfriend Sammi "Sweetheart" Giancola, a fellow castmate on "Jersey Shore", in August 2014 they broke up after 5 years of dating.
Split into simpler sentences: Ortiz-Magro started dating his on/off girlfriend Sammi "Sweetheart" Giancola, a fellow castmate on "Jersey Shore". In August 2014, they broke up after 5 years of dating.