Complex sentence: An unlikely cocktail resulted from friendships where former musical alliances were overcome by their relaxed and open attitude toward a defined common goal which seems invariably to end up in music that as cinematic as it is dramatic in nature.
Split into simpler sentences: An unlikely cocktail resulted where former musical alliances were overcome by their friendship and their relaxed and open attitude toward a common goal. The musical output so far invariably ends up as cinematic as it is dramatic in nature.