Complex sentence: The start of the Mersey is at the confluence of the River Tame and River Goyt in Stockport, it flows Westwards towards Warrington where the river widens before it then narrows as it passes between the towns of Runcorn and Widnes.
Split into simpler sentences: The start of the Mersey is at the confluence of the River Tame and River Goyt in Stockport. It flows Westwards towards Warrington where the river widens before it then narrows as it passes between the towns of Runcorn and Widnes.