::::Hi! Yes, there are two tools we use all the time, which yield slightly different results (one is precise, the other "fuzzy"). They are: 
 ::::*Earwig's Copyvio Detector (fuzzy but far-reaching) and 
 ::::*the Duplicate Detector 
 ::::I'm afraid we don't agree on the amount of difference there must be from a source: in the simplest possible terms, content you add here must be written entirely in your own words. It just isn't enough to change a few words or phrases in an existing text. Also, I'm afraid that a re-write cannot be started by copying over the pre-existing (and potentially infringing) text – the page needs to be re-written, in new language which is not that of the original, from scratch; content which is definitely original (infobox, categories, references etc) can be copied over, but nothing that might be "contaminated". Of course the place-names and so on will remain the same, but the rest of what you write needs to be, to look and to feel quite different from the source material. I suggest, if you don't mind, clearing the body text from that page and making a clean start. Do you think there might be other articles where you have stayed as near to your sources as you have in this one? If so, they too may need some revision; and if so, your help with that would be much appreciated. Regards,