Complex sentence: The party took a leading role in the campaign against the Marriage (Same Sex Couples) Act 2013 with its leader Sid Cordle speaking at a rally in Trafalgar Square and also while the debates were taking place he spoke at a rally outside Westminster.
Split into simpler sentences: The party took a leading role in the campaign against the Marriage (Same Sex Couples) Act 2013 with its leader Sid Cordle speaking at a rally in Trafalgar Square. While the debates were taking place he spoke at a rally outside Westminster.