Complex sentence: The group was formed in late 1967 in Toronto by lead singer John Kay, keyboardist Goldy McJohn, and drummer Jerry Edmonton (all formerly in Jack London & The Sparrows from Oshawa, Ontario).
Split into simpler sentences: The group was formed in late 1967 in Toronto by lead singer John Kay, keyboardist Goldy McJohn, and drummer Jerry Edmonton. The essential core of Steppenwolf was John Kay, Jerry Edmonton, and Goldy McJohn from The Sparrows (originally Jack London & The Sparrows from Oshawa, Ontario).