The main type of coal produced is steam coal, which is sold for the most part to US electricity producers.
(coal; produced; ) (The main type of coal; is; steam coal, which is sold for the most part to US electricity producers) (steam coal; is sold; for the most part to US electricity producers)
coal The main type of coal steam coal
produced is is sold
steam coal, which is sold for the most part to US electricity producers
for the most part to US electricity producers