Complex sentence: The white-faced cockatiel is one of cockatiel colour genetics mutation, with a mostly white or grayish face, they stand out because they have no orange cheek patches or yellow coloring at all.
Split into simpler sentences: The white-faced cockatiel is one of cockatiel colour genetics mutation, with a mostly white or grayish face. They stand out because they have no orange cheek patches or yellow coloring at all.