Complex sentence: He won the Asian Tour qualifying school in 1997, and played two seasons on that tour in addition to competing on the second tier European Challenge Tour before returning to Europe full time after winning a European Tour card at the 1999 final qualifying school.
Split into simpler sentences: He won the Asian Tour qualifying school in 1997, and played two seasons on that tour. In addition, he competed on the second tier European Challenge Tour, before returning to Europe full time, after winning a European Tour card at the 1999 final qualifying school.