Simplify the following text for a Grade 5 native English-speaking person.
Original: Bothwell Castle is a large medieval castle sited on a high , steep bank , above a bend in the River Clyde , in South Lanarkshire , Scotland .
Simplified: Bothwell Castle is a large medieval castle in Scotland . It is sited on a high , steep bank , above a bend in the River Clyde , in South Lanarkshire .