Complex sentence: The School of Agriculture (農家/农家; "Nongjia") encouraged farming and agriculture and taught farming and cultivation techniques, as they believed that agricultural development was the way to have enough food for the country.
Split into simpler sentences: The School of Agriculture (農家/农家; "Nongjia") encouraged farming and agriculture and taught farming and cultivation techniques. It was because it thought that agricultural development was the way to have enough food for the country.