Original: The band toured North America from December 1989 to March 1990, opening for Voivod, which was supporting their album Nothingface tour, with Faith No More also serving as an opening act at the beginning and end of the tour.
Simplified: Soundgarden went on a North American tour that startet in December 1989 and ended in March 1990. On this tour the band served as the opening act for Voivod on the band's Nothingface tour, with Faith No More also serving as an opening act at the beginning and end of the tour.