Complex sentence: Even so, such was Wonder's commercial appeal at the time that "Journey" went all way up to number four in the Rock and R&B Billboard charts in 1979 and is now considered by many to be a classic in its own right.
Split into simpler sentences: Even so, such was Wonder's commercial appeal at the time that "Journey" went all way up to number four in the Rock and R&B Billboard charts in 1979. It is now considered by many to be a classic in its own right.