That's because the hiatus wasn't the author's choice, they got into a fight with the editor/publisher (from what I can remember) so they were forced to stop. I guess it was a big regret for them to not be able to finish that story and we're glad they had the motivation to start again. I don't know about the artist but the style is completly different (the first one had that cute but amatorish style)

Is it common to make remake?
Is it same author and artist?