I have a professor that is grading like a masters level class for a community college requirement 100 level history course.

i have a professor that is grading like a masters level class for a community college requirement 100 level History course. He has not graded any assignments all semester and I finally get my midterm back with 73 our of 100.
I am a straight-A Student in all my previous classes and have never had such critique in my writing assignment.
i have already written the paper he just wants it revised as he says some of it is unclear, doesn’t understand what I am saying, or that I need to add more sources. It is only supposed to be three page to cover a 50 year span of the Civil War to World War I.
All of his comments can be included with the submission to your writer and the areas in the essay are highlighted.
I just checked my current version has 1345 words it is 4 pages and he wants more added to the text body with sources quoted. UGH