Complex sentence: Although police would not confirm a link between this event and the Ungdomshuset riots, the graffiti seems an obvious reference to the squat's address, and news sources around the world used the incident to mention the March 3 riots at the same time.
Split into simpler sentences: Although police would not confirm a link between this event and the Ungdomshuset riots, the graffiti seems to refer quite obviously to the squat's address. The fact is, news sources around the world used the incident to mention the March 3 riots at the same time.