Here is the first image This was like 31024 tris

Here is the second one I made but I tried to make it with fewer tris.

I you could help me that would be great 
Here is the first image This was like 31024 tris

Here is the second one I made but I tried to make it with fewer tris.

I you could help me that would be great 
if you plan to export it into roblox delete one export it then ctrl z and the part you deleted will be back and you delete the part you exported and export the other one
try the modifier decimate since you are using blender