Complex sentence: Rothmans sponsorship also extended to rallying, where they sponsored Walter Röhrl's 1982 World Rally Championship-winning Opel Ascona 400 and then the winning Porsche team at the 1986 Paris-Dakar rally.
Split into simpler sentences: Rothmans sponsorship also extended to rallying, where they sponsored Walter Röhrl's 1982 World Rally Championship-winning Opel Ascona 400. Rothmans also sponsored the winning Porsche team at the 1986 Paris-Dakar rally.