Complex sentence: Interim results in 2015 had net profits fall by 31%, to 5.4bn, but this was not surprising considering the dramatic falls in commodity prices of almost 40%, iron ore dominated earnings generating 45% of operating profits.
Split into simpler sentences: Interim results in 2015 had net profits fell by 31%, to 5.4bn, but was not surprising considering the dramatic falls in commodity prices. Despite prices falling almost 40%, iron ore dominated earnings generating 45% of operating profits.