Complex sentence: By the early 90's Fury had developed her skill enough that she started the process of producing and publishing her own music starting with a 4 song demo tape, which she eventually developed into a self-published EP titled "Soul Poison" in 1998.
Split into simpler sentences: By the early 90's Fury had developed her skill enough that she started the process of producing and publishing her own music starting with a 4 song demo tape. Eventually the songs from this tape were developed into a self-published EP titled "Soul Poison" in 1998.