Complex sentence: The MGB was a relatively modern design at the time of its introduction, utilizing a monocoque structure instead of the traditional body-on-frame construction used on both the MGA and MG T-types and the MGB's rival, the Triumph TR series.
Split into simpler sentences: The MGB was a relatively modern design at the time of its introduction. This was a considerable improvement in comparison to that of the traditional body-on-frame construction used on the earlier MGA and T-type models as well as the MGB's rival, the Triumph TR series.