Simplify the following text for a Grade 11 native English-speaking person.
Original: Between 1933 and 1934 , not only Haworth and fellow British chemist ( later Sir ) Edmund Hirst had synthesized vitamin C , but also , independently , the Polish chemist Tadeus Reichstein , succeeded in synthesizing the vitamin in bulk , making it the first vitamin to be artificially produced .
Simplified: In 1933\/1934 , the British chemists Sir Walter Norman Haworth and Sir Edmund Hirst , and separately the Polish Tadeus Reichstein , successfully synthesized the vitamin . It was the first man-made vitamin .