Complex sentence: Initially, Olympia and York, the developers of Canary Wharf, proposed building a new line, the Waterloo and Greenwich Railway from Waterloo through London Bridge to Canary Wharf and then to Westcombe Park in Greenwich, and would cost £400 million.
Split into simpler sentences: Initially, Olympia and York, the developers of Canary Wharf, proposed building a new line, the Waterloo and Greenwich Railway. This would run from Waterloo through London Bridge to Canary Wharf and then to Westcombe Park in Greenwich, and would cost £400 million.