Complex sentence: In May 2000, Tanner set up the website Streetball.co.uk which became Basketball247.co.uk in 2008-broadening its remit from just covering streetball to more mainstream basketball.
Split into simpler sentences: In May 2000, Tanner set up the website Streetball.co.uk. In 2008, it became Basketball247.co.uk-broadening its remit from just covering streetball to more mainstream basketball.