Complex sentence: The head of a hinny is said to resemble that of a horse, more so than mule heads, with shorter ears, although they are still longer than those of horses, and more horse-like manes and tails than mules.
Split into simpler sentences: The head of a hinny resembles that of a horse, more so than mule heads. Hinnies often have shorter ears, although they are still longer than those of horses, and more horse-like manes and tails than mules.