Complex sentence: In 2008, Justin Gaston began dating Miley Cyrus; in June 2009, Cyrus and Gaston ended their nine month relationship right before Miley went to Georgia to film The Last Song.
Split into simpler sentences: In 2008, Justin Gaston began dating Miley Cyrus. In June 2009, Cyrus and Gaston ended their nine month relationship right before Miley went to Georgia to film The Last Song.