Complex sentence: First of all, Ju-on was extremely popular and well recieved for being a V-Cinema film, it was popular enough to not only spawn a sequel, but more importantly to spawn a full blown theatrical remake.
Split into simpler sentences: First of all, Ju-on was extremely popular and well received for being a V-Cinema film. It was popular enough to not only spawn a sequel, but more importantly to spawn a full blown theatrical remake.