Simplify the following text for a Grade 6 native English-speaking person.
Original: It lies on the south bank of the Clyde at the `` Tail of the Bank '' where the River Clyde expands into the Firth of Clyde , and is in what was the county of Renfrewshire .
Simplified: It lies on the south bank of the Clyde at the `` Tail of the Bank '' where the River Clyde expands into the Firth of Clyde .