Complex sentence: The history of Sheffield, a city in South Yorkshire, England, can be traced back to the time of slave thing the founding of a settlement in a clearing beside the River Sheaf in the second half of the 1st millennium AD.
Split into simpler sentences: The history of Sheffield, a city in South Yorkshire, England, can be traced back to the time of slave thing. The founding of a settlement in a clearing beside the River Sheaf in the second half of the 1st millennium AD.