Complex sentence: Starting the 2011 perihelion passage the primary component 73P-C was recovered on 28 November 2010 near apparent magnitude 21.3; it came to perihelion (closest approach to the Sun) on 16 October 2011.
Split into simpler sentences: Starting the 2011 perihelion passage the primary component 73P-C was recovered on 28 November 2010 near apparent magnitude 21.3. The primary component 73P-C came to perihelion (closest approach to the Sun) on 16 October 2011.