Complex sentence: Dette attended the 1996 Ozzfest to promote the album "Undisputed Attitude" but was later fired from the band in 1997 after a fallout, with band members with Paul Bostaph returning to fill his place.
Split into simpler sentences: Dette attended the 1996 Ozzfest to promote the band's 1996 album "Undisputed Attitude". Dette but was later fired from the band in 1997 after a fallout, with band members with Paul Bostaph returning to fill his place.