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We are a Syrian humanitarian aid association called The Syrian Coalition for Relief, and our mission is to help the Syrian people. We gather money, foodstuffs and clothes and then we send them into Syria for people in need.

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We are a humanitarian Syrian association so called 'The Syrian coalition for relief' and our purpose is to help the Syrian people. We gather money, foodstuffs and clothes then send them into to Syria for the people there in need.

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We are a Syrian humanitarian Syrian association so called The Syrian Coalition For Relief, formed to help the Syrian people. We gather money, foodstuffs and clothes, then send and deliver them into Syria for to needy people in Syria.

I am not an English teacher but I think the above would work better for you. In the first sentence, you could use formed or created. This is my first attempt at correcting English so I hope this helps.

need to be corrected

We are a humanitarian Syrian association so called The Syrian coalition for relief to help the Syrian people. We gather money, Foodstuffs and clothes then send them into Syria for people in need.

We are a humanitarian organization in Syria called The Syrian Coalition for relief to the Syrian people.  Our organization gathers capital donations, food, and clothes to later send them to the most needy in Syria.