Complex sentence: In 1918 its southern boundary was on the north bank of the River Thames, to the west of the City of London, to the south of Holborn and St. Pancras and to the east of Kensington and Chelsea.
Split into simpler sentences: In 1918 its southern boundary was on the north bank of the River Thames. It was to the west of the City of London, to the south of Holborn and St. Pancras and to the east of Kensington and Chelsea.