Complex sentence: Chen originally believed that the conversion could be completed in four months, and that it would be ready for the November 2006 launch of the PlayStation Network; when it was finally released in February 2007, it did not include "half of the original design".
Split into simpler sentences: Chen originally believed that the conversion could be completed in four months, and that it would be ready for the November 2006 launch of the PlayStation Network. However, when it was finally released in February 2007, it did not include "half of the original design".