Complex sentence: She formed the Psychobilly band Kombat Katz in Stockholm in 2007 for whom she played double bass, wrote the lyrics, co-wrote the music and sang back up vocals.
Split into simpler sentences: She formed the Psychobilly band Kombat Katz in Stockholm in 2007. For Kombat Katz she played double bass, wrote the lyrics, co-wrote the music and sang back up vocals.