Hi, friend. Thank you very much for your answer.
I have been able to reduce the size of my mesh and now I can load my blender 3d model without having to split it into parts.
Now, my problem is that when I export in .dae it only exports the mesh WITHOUT ITS TEXTURES OR ITS LIGHTING.
My goal is to sell my 3D designs made in Blender with their textures and lights on the secondlife market.