Which sentences in the passage are grammatically correct?

Mahatma Gandhi was the most important leader in Indias history; Originally A Lawyer, he left behind a profitable law careere to help his people fight their British oppressors. Gandhi was committed to nonviolence, and he was determined to win freedom for his country without violence or confrontation, if possible.

gandhi developed a code of action over years, call civil disobedience. He called it nonviolent noncooperation, and it proved to be one of the keys to India's independence from Great Britain. Whenever there was trouble with British soldiers, Ganhdi urged the people of India not to fight, telling them instead to simply stand still.

Almost Twemty Years Later, Martin Luther king Jr. would take up the same position. He called it nonviolent resistance, but the results were the same. These two men of peace achieved more than anyone would have thought without ever once resorting to violence.