Complex sentence: In 1999, the 1991 line-up re-formed with the addition of The Demon on bass and they wrote the album "Orgy With The Dead", released on Miriquidi Productions, and started writing the next album, "Tormentorium".
Split into simpler sentences: In 1999, the 1991 line-up re-formed with the addition of The Demon on bass. The band released the album "Orgy With The Dead" on Miriquidi Productions, and then "Tormentorium".