Complex sentence: It survived into the 21st century with little controversy because it was seen to benefit the urban poor, food producers, grocers and wholesalers as well as farmers, thus it gained support from both liberal and conservative Congressmen.
Split into simpler sentences: It survived into the 21st century with little controversy because it was seen to benefit the urban poor, food producers, grocers and wholesalers, as well as farmers. Thus it gained support from both liberal and conservative Congressmen.