Complex sentence: Formed in 1993 as a techno group, with extra member Sami Salo (who later left the group), they moved to operate from a base in Barcelona to escape the long Finnish winters.
Split into simpler sentences: Formed in 1993 as a techno group, with extra member Sami Salo (who later left the group). They moved to operate from a base in Barcelona to escape the long Finnish winters.