Model messed up upon import

FYI, I use 3DS Max 2015.

This is the original model. Note the smoothing errors. I will do like to find a way how to deal with those smoothing errors as well.

https://i.imgur.com/iLf2mjF.jpg

The model was initially a .dae file. I first imported the .dae file with default settings and then I exported the .dae as an .smd using wallworm exporter. Then, when I imported the exported .smd using wallworm .smd importer, it ends up looking like this in the picture.

https://i.imgur.com/0I1x6XT.png

So I have attempted to import this model into 3DS Max, but upon import, the imported model is messed up in some parts and I am not too sure why.