Complex sentence: Biela started his career in 1983 with Karts before joining the Ford "Youngster Team" with Manuel Reuter and Bernd Schneider in 1987, for Formula Ford and the Deutsche Tourenwagen Meisterschaft, where he won the AVUS race in 1987.
Split into simpler sentences: Biela started his career in 1983 in karting before joining the Ford "Youngster Team" programme in 1987 alongside Manuel Reuter and Bernd Schneider. He drove for the team in Formula Ford and the Deutsche Tourenwagen Meisterschaft (the German touring car championship), where he won the race at AVUS in 1987.