Complex sentence: In 2004, when the Boxing Day Tsunami damaged Maakandoodhoo, its residents recolonized Milandhoo, which was officially recognized as an inhabited island on 20 March 2005.
Split into simpler sentences: In 2004, when the Boxing Day Tsunami damaged Maakandoodhoo, its residents recolonized Milandhoo. The government officially recognized Milandhoo as an inhabited island on 20 March 2005.