2001 Cadillac STS.. Headlights question?

Does the headlight housing come apart? And How? I just bought this car and the headlights are EXTREMELY foggy, causing lights to be very dim at night and not to mention they look like crap. I can't afford to buy new ones. Anyone who can help I will be thankful!!
Update: I have bought a restoration kit but it requires me to get inside the headlight and I need to know if it comes apart before I go breaking it open and find that they aren't made to go back together.
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