Complex sentence: As of March 2010, Honda has sold 2,661 units since the introduction of the Insight in April 2009 of which 847 were sold in the first three months of 2010.
Split into simpler sentences: As of March 2010, Honda has sold 2,661 units since the introduction of the Insight in April 2009. Of which, 847 were sold in the first 3 months of 2010.