Complex sentence: The chips used in American casinos rarely weigh more than 10 grams and are usually between 8.5g-10g; there is no official weight however and some, particularly coin inlayed chips, can weigh more.
Split into simpler sentences: The chips used in American casinos rarely weigh more than 10 grams and are usually between 8.5g-10g. There is no official weight however and some, particularly coin inlayed chips, can weigh more.