Henry Wadsworth Longfellow was a professor of Modern Languages at Harv

Hey Hero8888 ,

No, "at the same time was also" isn't making redundancy error. Infact, it is required.

Let's discuss a couple of versions:

1. Henry Wadsworth Longfellow was a professor of Modern Languages at Harvard, and at the same time was one of America’s greatest poets.

This tells us two qualities of Henry that happened at the same time.

2. Henry Wadsworth Longfellow was a professor of Modern Languages at Harvard, and was also one of America’s greatest poets.

This doesn't tell us the two things happened at the same time.

3. Henry Wadsworth Longfellow was a professor of Modern Languages at Harvard, and at the same time was also one of America’s greatest poets.

This tells us two qualities of Henry that happened at the same time. By using also, it is emphasizing that he was not only a professor but also a poet. So, there is a slight difference in the meaning. Also, since this construction has been used in the correct answer and we have solid reasons to reject other options, we can consider this construction correct.

For option E, yes "being" part is modifying the entire clause.

Does that make sense?