that's one of the joys in cinema, using riptide to import, I set the make it one mesh, I used function/optimize,  function/untriangulate (with make N-gons checked) and got a fairly nice mesh. (see object on left)

I also have an interactive polygon reduction deformer - works very well at this. (see object on right 70% reduction in poly's)

Cool to know I can handle most meshes you can export!

Pass no temptation lightly by, for one never knows when it may pass again!