Complex sentence: Karel Pešek (born 2 August 1992) is a Czech motorcycle racer who has competed in the 125cc World Championship, the FIM Superstock 1000 Championship and the European Superstock 600 Championship.
Split into simpler sentences: Karel Pešek (born 2 August 1992) is a Czech motorcycle racer. He has previously competed in the FIM Superstock 1000 Championship and the European Superstock 600 Championship.