I have an aloe vera plant that I have never done anything to except water.
There are several issues to consider.
1. Your plant will need to be fed, watered, and re-potted.
2. The leaves will probably be looking a bit unhealthy, and not that decorative. Re-potting will help, but isn't the total answer.
3. You possibly need to divide up your plant, as it is probably root bound. I think this is what I would do.
4. Re-plant the small side shoots. Cut them off from the main plant ensuring that you include some part of the stem that is also attached to some roots. Leave these cuttings for a day before you re-pot them, don't leave them in the sun though. The wounds will seal over this period, it will prevent fungus infections from taking hold where the wounds are.
5. I would use, or throw away the large ugly leaves. They are great for burns, sunburn, small cuts, especially to parts of the body with sensitive skin! They are very good for anyone with sensitive skin, it is a miracle plant from that point of view. Just slice the leaves lengthwise, and apply to the skin.
6. If the plant has not been getting enough light. This can cause the leaves to etiolate, or stretch up, looking for more light. This is another thing to consider.
7. I was wondering why you grow it? Most of the people I know grow it to cut the leaves of for its healing properties. To prevent the leaves getting too long, cut them off, and use them.
8. If you are looking for something decorative then there are 324 other species of Aloe to try, they are a great family.
9. Finally, my experience is that it doesn't like full, all day sun. Remember if it is on a window sill it may be getting too hot, this can cause a yellowish, pale, unhealthy look, and floppy leaves with no substance.
10. This species has a branched flowering stem that can grow to 90 cm. The flowers are yellow, and up to 3 cm across. It grows naturally in the Cape Verde Islands, Canary Islands, Mediterranean, Barbados, Jamaica, Mexico, Venezuela, Peru, and Bolivia.