Complex sentence: Also, Bart Williams is the current bass player for this band as of the "Nocturnal" era, although he did assist in the recording of "Unhallowed" he did not perform with the band on any recordings or in a live setting until 2007.
Split into simpler sentences: Also, Bart Williams is the current bass player for this band as of the "Nocturnal" era. Although he did assist in the recording of "Unhallowed" he did not perform with the band on any recordings or in a live setting until 2007.