Complex sentence: Thundermug was a Canadian band that existed from 1970 to 1976 and, in reformed versions, from 1991 to 1999, releasing two top 40 Canadian singles and five albums.
Split into simpler sentences: Thundermug was a Canadian band that existed from 1970 to 1976 and, in reformed versions, from 1991 to 1999. Altogether, they released two top 40 Canadian singles and five albums.