The jungle fever might not have killed him if he had not been driven mad by the business troubles, and the business troubles might not have put an end to him if the jungle fever had not assisted.

如果他没有被生意上的麻烦逼疯，丛林热可能不会杀死他，如果没有丛林热的帮助，生意上的麻烦也可能不会结束他的生命。