 Complete the following phrase:  From 1983 to 1985, Borgudd raced only on occasion, including his taking part in the 1984 and 1985 Macau Grand Prix. In 1985 he returned to race a Formula 1 car, an Arrows A6, in the new Formula 3000F1 combined championship finishing 10th in the Vallelunga race. He entered 5 races that season, but the rebuilt F1 cars were not competitive compared to the specified F3000 cars. Although he took part in the 