Complex sentence: Hennessey used two VBOX 3i data logging systems to document the run and had VBOX officials on hand to certify the numbers, but not beating the 267.856 mph record of the Bugatti Veyron Super Sport, witch is factory limited to 258mph.
Split into simpler sentences: Hennessey used two VBOX 3i data logging systems to document the run and had VBOX officials on hand to certify the numbers. However not beating the 267.856 mph record of the Bugatti Veyron Super Sport, witch is factory limited to 258mph.