Complex sentence: Furthermore, when the rider shifts any weight from the seat to the pedals, he or she is shifting weight from the spung part of the bike to the unsprung parts, and part of their weight would not be suspended by the suspension system anymore.
Split into simpler sentences: Furthermore, when the rider shifts any weight from the seat to the pedals, he or she is shifting weight from the spung part of the bike to the unsprung parts. As such, part of their weight would not be suspended by the suspension system anymore.