Complex sentence: Cardigans can be any shade of red, sable, or brindle; they can also be black with or without tan brindle or blue merle with or without tan or brindle points.
Split into simpler sentences: Cardigans can be any shade of red, sable, or brindle. They can also be black with or without tan brindle or blue merle, with or without tan or brindle points.