Complex sentence: It has frequently been suggested that individuals may have rammed each other head-on, as in mountain goats and musk oxen, however the rounded shape of the skull might tend to result in glancing blows which would damage the neck.
Split into simpler sentences: It has frequently been suggested that individuals may have rammed each other head-on, as in mountain goats and musk oxen. However, the rounded shape of the skull might tend to result in glancing blows which would damage the neck.