original: He rowed across in a boat and discovered the Japanese submarine.
simplifications: He crossed in a boat and found the Japanese submarine. He rowed in a boat and found the submarine. He was moving on a boat and found the Japanese submarine. He discovered a Japanese submarine while rowing his boat. He crossed in a boat and discovered the Japanese submarine. He used a boat to row across and found a Japanese submarine. He rowed across and found the Japanese submarine. He rowed across in a boat. He discovered the Japanese submarine. He rowed over in a boat and found the Japanese sub. He rowed across a boat and discovered a Japanese submarine.