Complex sentence: Some breeds, such as the Exmoor, are uniform in colour and pattern, but others include a wide range of colours--however, only the Shetland can be skewbald or piebald.
Split into simpler sentences: Some breeds, such as the Exmoor, are uniform in colour and pattern, but others include a wide range of colours. However, only the Shetland can be skewbald or piebald.