Input (grade 9): So well-known was his skill as a Senator throughout this period that Webster became the northern member of a trio known as the "Great Triumvirate", with his colleagues Henry Clay from the west and John C. Calhoun from the south.
Output (grade 5): Webster became the northern member of a group known as the "Great Triumvirate". They included his colleagues Henry Clay from the west and John C. Calhoun from the south.