改进题：Most of the money came from selling the secret of a new type of potato he had developed.

译文：大部分钱来自他被出售用来培育土豆新品种的秘方得来的。

改进题：Most of the money came from selling the secret of a new type of potato he had developed.

译文：大部分钱来自他被出售用来培育土豆新品种的秘方得来的。

改进的译文：大部分钱是靠出售他培育土豆新品种的秘方得来的。