Complex sentence: Ronnie then uses his substantial personal inheritance funds to purchase an untraceable trailer and car, and fabricates a wooden cart that is identical to the cash carts used at Harold's--the most important component of the heist.
Split into simpler sentences: Ronnie then uses his substantial personal inheritance funds to purchase an untraceable trailer and car. He fabricates a wooden cart that is identical to the cash carts used at Harold's--the most important component of the heist.