Consider sentence 1: "Per your request, we edited our research plan, delegated or assigned each research question to a team member, and recruited a team lead." This sentence is not parallel. A better revision would be: Per your request, we edited our research plan, delegated team responsibilities, and recruited a team lead. No revision is necessarythis sentence uses parallel structure. Per your request, we have edited our research plan, are delegating team responsibilities, and recruited a team lead