Complex sentence: By Tuesday morning, Oasis were edging ahead of Blur, with a regional split having emerged amongst consumers: record buyers in the north of England were preferring Oasis's record, while those in the Midlands chose Blur's.
Split into simpler sentences: By Tuesday morning, Oasis were edging ahead of Blur. A regional split had emerged amongst consumers, with buyers in the north of England preferring Oasis's record, and those in the Midlands preferring Blur's.