Well, I'm not a native english speaker....but here's my reworked version of your description:
First plans of the Reyena class warship were created 14 years after the construction of the Colossus began. But with regards to the very high cost of its construction and in favor of mass production of Deimos-class corvettes, the Reyena project was rejected. In 2371, after experiencing the second great war, the project was reactivated.
The GTCv Reyena-class warship is a heavy fire support ship, able to fight with even the biggest capital ships. She possesses almost twice the fire power of a Deimos-class corvette. She's also equipped with 29 various anti-fighter turrets. Thanks to the new tritanium hull technology, the Reyena has one of the strongest hulls in the GTVA fleet. But all those advantages came at the cost of low speed and poor manouverability.
Today, six ships of this class are in service, another five are in production.
EDIT: Included Ghostavos corrections..thanks;)