Complex sentence: The Britten motorcycles were unusual for their heavy use of carbon fiber for the fairing, wheels and swingarm whilst having no chassis in the traditional sense, instead the engine behaved as a stressed member of the chassis and each end of the motorcycle was bolted to it.
Split into simpler sentences: The Britten motorcycles were unusual for their heavy use of carbon fiber for the fairing, wheels and swingarm. Instead, the engine behaved as a stressed member of the chassis and each end of the motorcycle was bolted to it.