Complex sentence: In June 2015, in an interview with Power 106, The Game said that the album was about 90% done, when he said that he has been waiting on Dr. Dre to get back from vacation, so he could finish the album.
Split into simpler sentences: In June 2015, in an interview with Power 106, The Game said that the album was about 90% done. He also said that he has been waiting on Dr. Dre to get back from vacation, so he could finish the album.