Complex sentence: For much of their career, the band has been a trio with drummer Tré Cool, who replaced former drummer John Kiffmeyer in 1990 prior to the recording of the band's second studio album, "Kerplunk" (1992).
Split into simpler sentences: For much of their career the band has been a trio with drummer Tré Cool. Cool replaced former drummer John Kiffmeyer in 1990, prior to the recording of the band's second studio album, "Kerplunk" (1992).