I have a mutant Yucca!

I am in North Texas (8a). This Yucca plant has been growing at the corner of our house as long as I've been here (25 years). It is getting out of control. At some point it split itself into three separate heads, which is super beautiful when it flowers, but a PITA to take care of. It got so heavy at one point it fell, onto its side, then started growing up again (hence the gangster lean) also, there is a smaller Yucca that has started to grow off of its root system.

How do I go about getting this thing back to normal?

Mutant Yucca