Complex sentence: There are also some reports that they have a mildly toxic venom that can cause local reactions in humans; with their huge fangs there is little doubt that they could bite if threatened, but the venom has not been well studied.
Split into simpler sentences: There are also some reports that they have a mildly toxic venom that can cause local reactions. With their huge fangs there is little doubt that they could bite if threatened, but the venom has not been well studied.