Complex sentence: Pietro Frua was commissioned from De Tomaso the restyling of the Tom Tjaarda-designed Longchamp, to give the new car a distinctive Maserati feel; the interior was also upgraded to incorporate classic Maserati elements such the steering wheel and instrumentation.
Split into simpler sentences: Pietro Frua was commissioned from De Tomaso to undertake the restyling of the Tom Tjaarda-designed Longchamp, to give the new car a distinctive Maserati feel. The interior was also upgraded to incorporate classic Maserati elements such the steering wheel and instrumentation.