Complex sentence: After the victory at Trangen, Christian August felt that the Swedish pressure against Kongsvinger had calmed down and choose to send more troops to face the Swedes 3rd brigade at Rødenes.
Split into simpler sentences: After the victory at Trangen, Christian August felt that the Swedish pressure against Kongsvinger had calmed down. He sent more troops to face the Swedes' 3rd brigade at Rødenes.