Complex sentence: After LeBoeuf's departure in 1988, Baillie & the Boys toured as a duo, until Roger McVey was chosen as a replacement in 1995; four years later, McVey himself departed, with LeBoeuf again assuming the role of bass guitarist and harmony vocalist.
Split into simpler sentences: After LeBoeuf's departure in 1988, Baillie & the Boys toured as a duo, until Roger McVey was chosen as a replacement in 1995. Four years later, McVey himself departed, with LeBoeuf again assuming the role of bass guitarist and harmony vocalist.