Complex sentence: Redi performed an experiment involving removing the brain of a land-tortoise, which then proceeded to live six months, fresh-water tortoises, when subject to the same experiment continued similarly, but did not live so long.
Split into simpler sentences: Redi performed an experiment involving removing the brain of a land-tortoise, which then proceeded to live six months. Fresh-water tortoises, when subject to the same experiment, continued similarly, but did not live so long.