Complex sentence: The pair played with a revolving-door lineup of musicians before the permanent addition of guitarist Martin Halfbahn prior to recording their debut album, The Nocturnal Silence, in 1993.
Split into simpler sentences: The pair played with a'revolving door' lineup of musicians until the permanent addition of guitarist Martin Halfbahn. This addition occured prior to recording their debut album, The Nocturnal Silence, in 1993.