Complex sentence: The race in Germany will be held at the Nürburgring Nordschleife circuit while the Portuguese round will be held at the Circuito Internacional de Vila Real, a street circuit east of Porto.
Split into simpler sentences: The race in Germany will be held at the Nürburgring Nordschleife circuit. The Portuguese round will be held at the Circuito Internacional de Vila Real, a street circuit east of Porto.