DS says it is all about comparing to other factors over time.
So for example if the question was about how did African-American leaders advance civil rights.
You would never look at each leader in isolation. You would say that MLK in the 60s did XYZ such as his use of media in the Birmingham riots, however in the 1880s Booker T Washington took a different approach. Rather than using the media to show the oppression of the American Government as MLK did, he set up the Tuskegee Institute which allows African-Americans to get a higher level of education, so in the long term they would benefit by being in control of their civil rights. (This is over simplified).
You would define in the intro what an advancement of civil rights is (usually 3 factors) and then refer back to those 3 factors in 3 separate paragraphs - Factor 1 in paragraph 1 etc. Then you would compare the time periods, usually focus on social, political and economic (if it fits the question).
He's says you have to compare / contrast for each civil rights leader. In the example above you would use their use of media or closeness to president or keeping momentum going. This is because social, political, economic doesn't fit with the example (Try to get to 3-4 leaders in each paragraph with at least 2 examples for each civil rights leaders. so you get 6-8 synthesised points in each paragraph.
Make sure to compare each civil rights leader to each other.
End with conclusion.
DS stresses that this is a very simplified response - he's off to his leavers meal tonight and busy getting ready but happy to help more tomorrow. He's taught by a teacher who marks and writes the papers.