Complex sentence: Wim Esajas, the first athlete from Suriname to the Olympics, was entered in the 800 metres, but was told due to a scheduling error that the heats were in the afternoon, so he rested in the morning.
Split into simpler sentences: Wim Esajas, the first athlete from Suriname to the Olympics, was entered in the 800 metre track race. He was mistakenly told that the heats were in the afternoon, so he rested in the morning.