THere is something called "release letter" for SIX months between two Companies. Though it is between two companies, it is legally endoresed thru Immigration dept and the application is something usual Arabic written application form.

If both companies agree, you can work in the second company without any problem. You can ask for such Release letter - 3 times, means nearly 1.5 year. This way, you can complete the stipulated ONE year and transfer to the second company