Complex sentence: The car had many other car safety-related features, novel at the time although routine now, including seatbelts, a roll cage, side-impact bars, a collapsible steering column, and a padded instrument panel.
Split into simpler sentences: The car had many other car safety-related features, novel at the time, and now routine. These features included seatbelts, a roll cage, side-impact bars, a collapsible steering column, and a padded instrument panel.