Complex sentence: Welnick joined Bob Weir's new group, Ratdog, as the keyboard player, touring with them around the U.S. About six months after Garcia's death, Welnick attempted suicide on the tour bus to Monterey, California.
Split into simpler sentences: Welnick joined Bob Weir's new group Ratdog as the keyboard player, touring with them around the USA. He attempted suicide about six months after Garcia's death on the Rat Dog tour bus on the drive to Monterey, California.