Simplify the following text for a Grade 10 native English-speaking person.
Original: During British rule , as part of British Raj , the town was the administrative headquarters of the Upper Sind Frontier District of the Bombay Presidency ; with a station on the Quetta branch of the North-Western Railway .
Simplified: During British rule , as part of British India , the town was the headquarters of the Upper Sind Frontier District of the Bombay Presidency .