Complex sentence: Other work was also done by agricultural aircraft, as in foreign countries, particularly outside the February to May prime season; clover seed is sown and spraying is carried out with insecticides, fungicides, and weed killers as well as general utility work.
Split into simpler sentences: Other work was also done by agricultural aircraft, as in foreign countries, particularly outside the February to May prime season. Clover seed is sown and spraying is carried out with insecticides, fungicides and weedkillers as well as general utility work.