With the premise 'Now I am writing to ask if you would continue your support with a further donation for 1990.', is 'You donated in the past, and so we would like you to donate even more in the future. ' simply an unrelated statement?
Now I am writing to ask if you would continue your support with a further donation for 1990.###You donated in the past, and so we would like you to donate even more in the future. 