Complex sentence: Some of the songs, however, are evocative of songs from their previous efforts, such as "Bugman", "Coffee & TV", "1992" and the instrumental closer "Optigan 1", which was created using an Optigan optical organ.
Split into simpler sentences: Some of the songs, however, are evocative of songs from their previous efforts, such as "Bugman", "Coffee & TV" and "1992". The instrumental closer "Optigan 1", which was created using an Optigan optical organ.