Complex sentence: The chief disadvantage to a metal money clip is that it cannot typically hold large amounts of cash due to the inflexibility of the metal and it may be difficult to push the bills into the clip depending on the design.
Split into simpler sentences: The chief disadvantage of a metal money clip is that, due to the inflexibility of the metal, it cannot typically hold large amounts of cash. Depending on the design, it may also be difficult to push the bills into the clip depending on the design.