Complex sentence: In 1994, Winter would along with the team defect to DTM, driving an Opel Calibra, it was at Round 10, Race 1 at AVUS, he was involved in fiery accident, in which his car disintegrated in a fireball.
Split into simpler sentences: In 1994, Winter would along with the team defect to DTM, driving an Opel Calibra. In Round 10, Race 1 at AVUS, he was involved in fiery accident, in which his car disintegrated in a fireball.