Complex sentence: In 2010, the first mining operations of the polyhalite mineral commenced at Boulby Mine, a subsidiary of Israel Chemicals Ltd. Boulby Mine is currently the only producer of polyhalite which is marketed by Israel Chemicals Ltd as Polysulphate.
Split into simpler sentences: In 2010, the first mining operations of the polyhalite mineral commenced at Boulby Mine. The mine is currently the only producer of polyhalite which is marketed by Israel Chemicals Ltd as Polysulphate.