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How can this "list" not include the most successful F1 Driver to try other series and the only one ever to complete the Triple Crown. Graham Hill should be at the very top of this list.

Also Michael Schumacher competed in the German Superbike series after his first retirement from F1 

A huge list of F1 drivers went on to other racing series, and never went back to F1.

Jack Brabham, Jackie Stewart, Jochen Rindt, Graham Hill, Bobby Unser, Emerson Fittipaldi, A. J. Foyt, and Mario Andretti all climbed behind the wheel of an IndyCar to try their hand at the Indy 500 oval. Also on this Indy 500 list are Nelson Piquet, Nigel Mansell, Denis Hulme, Jacques Villeneuve, Eddie Cheever, Danny Sullivan and Mark Donohue. Alexander Rossi won the Indy 500 in his rookie year. Takuma Sato also won the Indy 500. Juan Pablo Montoya has been in a bunch of different racing series and has been very successful in most of them and also won the Indy 500.

The list goes on with these former F1 drivers that raced other series that I recognize: Romain Grosjean, Sebastien Bourdais, Max Chilton, Scott Speed, Michael Andretti, Skip Barber, Rubens Barrichello, Bob Bondurant, Sebastien Buemi, Eddie Cheever, Christian Fittipaldi, Esteban Gutierrez, Mika Häkkinen, Brendon Hartley, David Hobbs, Damond & Graham Hill, Stefan Johansson, Robert Kubica, Kevin Magnussen, Roger Penske,Vitaly Petrov, Keke Rosberg, Ralf Schumacher, Bruno Senna, Gabriele Tarquini...   and I am sure there are many more that I missed.