Removing the dark glitches on a mesh in Blender

I imported a waterslide with tons of wedges from Roblox to Blender, and I was shown this:

This is how it looks like in Studio and how it should look like in blender:


I tried merging the vertices and changing it to smooth and flat shading. How do I fix this?

Click on ‘Clear Custom Split Normals’
And also remove the faces between where theyre merged

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