Complex sentence: Brabham returned to Formula One in 1994 with the under-funded Simtek team who suffered the blow of the death of Roland Ratzenberger whilst in qualifying for the San Marino Grand Prix.
Split into simpler sentences: Brabham returned to Formula One in with the under-funded Simtek team. The team suffered the blow of the death of Roland Ratzenberger whilst in qualifying for the 1994 San Marino Grand Prix.