Complex sentence: In contrast, other even-toed ungulates, such as goats and deer, have front teeth only on the bottom; this doesn't let them chew very well, thus they swallow and regurgitate their food to allow rumination.
Split into simpler sentences: In contrast, other even-toed ungulates, such as goats and deer, have front teeth only on the bottom. This doesn't let them chew very well, thus they swallow and regurgitate their food to allow rumination.