다음 지문에서 맨 마지막 문장 을 봐주세요...

He did not go to school for a very long time, but managed to learn a great deal by himself. He worked at many different jobs. One job was on a newspaper. Another job he had was in a bank, but when some money was missing from the bank, he was accused of stealing it. He was sent to prison for more than three years. While he was in prison, he first began to write short stories. After he got out of prison, he went to New York and kept on writing. Rather than his real name, he chose instead the pen name of O. Henry.

instead of로 of가 instead 뒤에 오지 않고 떨어져 있습니다.
이렇게 자주 쓰이나요?
해석은 instead A of B 즉, B대신 A를 라고 하면 되나요??
또, 위문장을 he chose the pen name instead of O.Henry 라고 쓰면 안되나요?
왜 윗문장처럼 썼나요?
자세한 설명을 부탁드립니다.