Complex sentence: A "Kennedy Must Go" petition was started by "The Liberal" magazine (a publication with no affiliation to the Liberal Democrats) and allegedly had been signed by over 3,300 party members including 386 local councillors and two MPs by the end of 2005.
Split into simpler sentences: A "Kennedy Must Go" petition was started by "The Liberal" magazine which had no affiliation to the Liberal Democrats. It allegedly had been signed by over 3,300 party members including 386 local councilors and two MPs by the end of 2005.