Complex sentence: Snakes of the genus "Alsophis" are all relatively small only growing to about 1 metre (39⅜ inches) in total length, and experience sexual dimorphism, meaning that females grow much bigger than males (Savit 420).
Split into simpler sentences: Snakes of the genus "Alsophis" are all relatively small, usually less than about 1 metre (39⅜ inches) in body length. Females grow much bigger than males (Savit 420).