Complex sentence: Manuilovskoye represents one of the largest iron ore reserves in Ukraine and in the world having estimated reserves of 3.5 billion tonnes of ore grading 30% iron metal.
Split into simpler sentences: Manuilovskoye represents one of the largest iron ore reserves in Ukraine and in the world. It is estimated that it has reserves of 3.5 billion tonnes of ore grading 30% iron metal.