Complex sentence: She then got involved with Tad Martin and eventually became engaged to him however she also grew close to Dimitri Marick and when Tad's growing jealousy got to her she eventually left him and eloped with Dimitri.
Split into simpler sentences: She then got involved with Tad Martin and eventually became engaged to him. When Tad's growing jealousy got to her, she left him and eloped with Dimitri.