Can your parents carry out day to day tasks (cleaning, cooking, dressing) on their own?
Thanks for your question.
If you are a UK citizen and they do not have any other connection to the UK then the only possible visa would be an "adult dependent relative" visa.
The .gov webpage on this is here under the heading "Coming to be cared for - you’re an adult dependent relative":
You willl see the eligibility criteria listed. You must be able to prove that they need care to do every day tasks. You must also be able to prove that the care they need is not available or affordable in the country where they leave (eg sudan if they return there).
You must also be able to show that you can support/accomodate them without the need to access public funds.
If the proper care is not available in Sudan then the best way forward would probably be for them to return there, evidence the lack of available care there for their condition and then apply.
It's a really complicated application. This means that you should really stronlgy consider instructing a UK based solicitor in order to draft the application and collate the necessarysupporting documentation.
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Is there any further information you require?
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The link doesn't say that I'm afraid.
Both you and your parents are adults, which means that they can only apply to settle permanently with you if they are dependent on you in the way that I have described above.
They can apply for visit visas of lengths of either 6 months, 1 year, 2, 5 or 10 years which would mean that they would be able to enter/leave/enter the UK as many times as they liked within the visa period but subject to not spending more than 6 months in any 12 months period in the UK and only on a visit basis.
I am sorry, I have a meeting now for about an hour but I would be grateful if you would leave feedback and I will answer any follow up questions when I return.Tom