Complex sentence: He announced his departure from the band on August 13,2008, just before a scheduled South American tour, because he wanted to be with his family and had an upcoming job; the planned tour would interfere with that.
Split into simpler sentences: He announced his departure from the band on August 13,2008. His reasons were because he wanted to be with his family, he had an upcoming job, and that the then-upcoming South American tour would interfere with that.