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I'm going to be the dissenting voice here. I think you have a dracaena, sometimes sold as a palm.
I would cut the dead parts off, give what's left a good cleaning, and leave it in the pot its in. I'm not a big fan of potting up. Eventually you get something too big to manage, and that pot is too pretty to break.
Alternatively, you could root each branch, as someone suggested above, and see if the stump rejuvenates, but you would lose the potentially great looking plant you have now.
It could be a dracaena draco, they grow into large umbrella shaped trees. Both the dracaena and the yucca are in the asparagus family, so are related and share growth habits.
OP you have a multi trunked 'Yucca Gloriosa' which has outgrown it's pot. It's root bound and will one day break the pot if you don't re-pot to a larger size. You could actually take it out of the pot and separate the plant and grow more in pots.
I agree about repotting. Before doing this, I would remove the dead leaves, just so you can see what you have. Then you can decide whether you want to divide it or transplant it all together. Wrap it in a tarp or similar before repotting so that you won't get poked by those sharp "daggers." This will also protect the plant. And, as has been said, don't select a pot with a smaller mouth. If it is root bound, it may be really hard to get it out without breaking the pot (unless you want to cut the plant, as suggested earlier.) When repotting, look up the soil requirements for yuccas. They need a less rich soil than many plants (more sand and minerals.)
I would have guessed a dracena of some sort, but aren't those related to yuccas? In any case, pull off the dead leaves and see what it looks like after that.
I've learned a lot about yucca from this thread. OP may have one. My advice on how to deal with it would be the same.
I had one like it, whatever it is, for over 20 years. I finally got tired of it (and big plants in general. I am too old) and didn't bring it in last winter. I miss it.
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