Complex sentence: By the end of the 20th century Melbourne had 3.8 million people, inhabiting an urban sprawl from Werribee in the south-west to Healesville in the north-east and encompassing the whole of the Mornington Peninsula and Dandenong Ranges to the south and east.
Split into simpler sentences: By the end of the 20th century Melbourne had 3.8 million people. The urban sprawl spread from Werribee in the south-west to Healesville in the north-east and encompassing the whole of the Mornington Peninsula and Dandenong Ranges to the south and east.