Simplify the following text for a Grade 7 native English-speaking person.
Original: 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 .
Simplified: 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 .