Complex sentence: Cambridge, on the other hand, has little local stone, so the building material has been brought in from many different sources; the contrasts in architecture in Cambridge are more pronounced, as can be seen when comparing King's College with the neighbouring Senate House.
Split into simpler sentences: Cambridge, on the other hand, has no local stone, so stone has been brought in from a many different sources, resulting in a far greater variety of character. The contrasts in architecture in Cambridge are more pronounced, as can be seen in comparing King's College with the neighbouring Senate House.