Complex sentence: The swimming competitions at the 2016 Summer Olympics in Rio de Janeiro is scheduled to take place from 6 to 13 August at the Olympic Aquatics Stadium, whereas the open-water marathon will be held from 6 to 7 August in Fort Copacabana.
Split into simpler sentences: The swimming competitions at the 2016 Summer Olympics in Rio de Janeiro is scheduled to take place from 6 to 13 August at the Olympic Aquatics Stadium. The open-water marathon will be held from 6 to 7 August in Fort Copacabana.