Complex sentence: He competed in the 10,000 metres at the 2015 World Championships in Beijing finishing ninth, and the 2016 Rio Olympics in the 5,000 metres and 10,000 metres, finishing eight and sixth respectively.
Split into simpler sentences: He competed in the 10,000 metres at the 2015 World Championships in Beijing finishing ninth. He ran at the 2016 Summer Olympics in the 5,000 metres and 10,000 metres, finishing eight and sixth respectively.