It's a tesselated genesis 2 model. The hip is grouped wrong also, a similar problem to the collar grouping that I pointed out in OP's other thread. There's a small strip of polys between the buttocks that should be grouped to the hip which causes both thighs to have touching groups. Most likely what's causing the splitting. The mesh obj is also unwelded at body part groups, which is of no consequence to the function of the cr2 in Poser but will be useless for using for sculpting FBM via imports elsewhere. The default state of the original Genesis 2 obj is of course quads and "unimesh"...

Adding those polys to the hip will most likely fix the tearing. I took a look at the skeleton and it appears to be a good rig, I haven't looked at Genesis 2 in a long time but it appears to be the original rig.

I have some opinions about all of this but I'll keep that to myself.

Good luck.