Complex sentence: Despite its short length and its having Shaw's hairpin, the tightest corner of any UK track, Mallory is a fast circuit, as from the hairpin on it is flat-out all the way to Gerard's, a very long right-hander.
Split into simpler sentences: Despite its short length, Mallory is fast despite having Shaw's hairpin, the tightest corner of any UK track. From then on it's flat-out all the way to Gerard's, the never ending right-hander.