Simplify the following text for a Grade 10 native English-speaking person.
Original: The site is situated at the foot of the Rohri Hills where a fort ( Kot Diji Fort ) was built around 1790 by Talpur dynasty ruler of Upper Sindh , Mir Suhrab who reigned from 1783 to 1830 AD .
Simplified: The site is situated at the foot of the hills where a fort ( Kot Diji Fort ) was built around 1790 by Talpur ruler of Upper Sindh , Mir Suhrab who reigned from 1783 to 1830 .