Original sentence: Electric Boat built Ohio class fleet ballistic missile submarines and Seawolf class (SSN 21) attack submarines as well as others.Now most of the work done in the ship yard is focused on the new construction of Virginia class submarines
Edited sentence: Electric Boat built the Ohio class fleet ballistic missile submarines and Seawolf class (SSN 21) attack submarines as well as others.Now most of the work done in the ship yard is focused on the new construction of Virginia-class attack submarines