Complex sentence: The Act of Parliament authorised the company to raise up to £600,000 to fund construction of the main line from where the eastern branch of the River Brent enters the Thames at Syon House near Brentford, to the Oxford Canal at Braunston.
Split into simpler sentences: The Act of Parliament authorised the company to raise up to £600,000 to fund construction. The act authorised construction of the main line from where the eastern branch of the River Brent enters the Thames at Syon House near Brentford, to the Oxford Canal at Braunston.