Unable to Determine Proper Print Scale of STL model
The STL format does not define unit information. So there is no way of knowing, from a STL file alone, what size it should be.
However there are only a handful of units people design with. So the unit is most likely one of inches, cm or mm. So if you inverse convert between those combinations you'll likely find the real size.
Your image is somewhat inconclusive. But it seems to indicate your object is in fact larger than your bed. As it it is 18-19 pips of height and i would interpret each as 10 mm from the image. Which would indicate your model is correct.
Split and glue? Print corner to corner you should have 207 mm length that way (but not necessarily width).