Complex sentence: The Butler's Garter Snake, "Thamnophis butleri", is a medium sized (averaging lengths of 15-20 inches), slender snake with three yellow to orange stripes along the length of the body.
Split into simpler sentences: The Butler's Garter Snake, "Thamnophis butleri", is a species of garter snake. It is a medium sized (averaging lengths of 15-20 inches), slender snake with three yellow to orange stripes along the length of the body.