Complex sentence: Rossi suffered a highly disappointing engine failure in his rome race at Mugello when closely following Lorenzo for the lead after starting from pole position; it was Rossi's first technical failure since the 2007 San Marino Grand Prix.
Split into simpler sentences: Rossi suffered an engine failure in his rome race at Mugello when closely following Lorenzo for the lead after starting from pole position. It was Rossi's first technical failure since the 2007 San Marino Grand Prix.