Complex sentence: The gang is obsessed with keeping Mrs. Throckmorton happy to keep her from closing down the lodge which has become unpopular due to activity caused by Herman the Hermit, a grumpy Christmas-hating hermit who just wants to be left alone.
Split into simpler sentences: The gang is obsessed with keeping Mrs. Throckmorton happy to keep her from closing down the lodge. Due to activity caused by Herman the Hermit a grumpy Christmas-hating hermit who just wants to be left alone.