Complex sentence: Also, consumption of most root vegetables involves uprooting and killing the entire plant, in contrast to consumption of most other terrestrial vegetables, upon which the plant lives on after plucking the vegetables (or it was seasonally supposed to wither away anyway).
Split into simpler sentences: Also, consumption of most root vegetables involves uprooting and killing the entire plant. Whereas consumption of most terrestrial vegetables doesn't kill the plant (it lives on after plucking the vegetables or it was seasonally supposed to wither away anyway).