while it looks like they have streched from lack of light at some point in their life, that may not be the cause it is important that they get direct sunlight atleast 5-6 hours a day the more the better, usually there is trees or buildings or walls, fences etc that prevent them from getting direct sunlight from sunrise to sunset.
have they ever had any side growth and perhaps lost a lot of leaves due to dying and falling off?
its hard to tell from the pics as it doesnt show the whole plant but it looks like the plants was topped way to early like at the first or second internode which may be why they look like they do now, generally outdoor plants you want to get decent size and if you choose to top them you would wait until atleast the fifth internode or possibly even longer if you can safely grow a large plant.
curling up leaves with dark spots is probably a nutrient deficience of some sort dont really notice them in your pics but its fairly late in the plants life to be worried to much about it now.