Complex sentence: In late October 2007, talks between Local One and the League again stalemated this time instead of locking out Local One, the League decided to instead implement new work rules to which Local One contested without any prior notification to what the new rules were to be.
Split into simpler sentences: In late October 2007, talks between Local One and the League again ended in a stalemate. The League implemented new work rules to which Local One contested without any prior notification to what the new rules were to be.