Complex sentence: The cottontail does not fear the jack rabbit, in fact the jack rabbit is very skittish and will retreat from a confrontation in most instances; however, the black-tailed jack rabbit is much bigger, and consumes much more food at eating times.
Split into simpler sentences: The cottontail does not fear the jack rabbit, in fact the jack rabbit is very skittish and will retreat from a confrontation in most instances. However, the black-tailed jack rabbit is much bigger, and consumes much more food at eating times.