Like John B. Ervin, I believe in the importance of gaining a good education, and I also share his passion in engaging my community and helping to bring diverse people together.
This sentence doesn't add anything, as it just repeats the prompt in a different way. So, get rid of it.
My parents are from two different cultures and ethnic background
s .
My real-life experience, coupled with my family background can contribute to bringing diverse groups of people together. This experience can bring tremendous diversity to Washington University and can contribute to the mix of perspectives at this institution.
You are repeating stuff again.
I'm not sure about the example of your friends. If I were you, I'd elaborate on the debating group or soccer team, and select one example from there.
However, this is just a personal opinion.
The conclusion looks ordinary. Think of something different.