 Complete the following phrase:  In the buildup to the 2016 Summer Paralympics in Rio de Janeiro, Nambala took part in the 2015 IPC Athletics World Championships in Doha. He took another two World Championship medals, a bronze in the 400 metres, despite posting a faster time than won him the title two years prior, and a gold in the 200 metres. He followed the World Championships with his first African Games, competing in the 