Complex sentence: The road infrastructure was also improved during this period and extended from Kolkata to Peshawar by Emperor Sher Shah Suri; later during the British Raj it came to be known as the famous Grand Trunk Road.
Split into simpler sentences: The road infrastructure was also improved during this period. It was extended from Kolkata to Peshawar by Emperor Sher Shah Suri; later during the British Raj it came to be known as the famous Grand Trunk Road.