Use semi-colons, be concise and specific.
Don’t list the same thing as an activity and an honor. Pick one category and go with it. If your honors section is light, shift it there.
It’s simply your position/title. It’s OK if you didn’t hold that title during the entire period of involvement - they know that.
You have to make a judgement call as to what is well-known vs. not. Lean towards not overly-describing the organization, better to write more about what you did/achieved.