Hi Chris,
You can put in there the summary of the achievements you've done for the projects up to the point you transitioned to another project manager. They're more interested of the results or success done by you as the PM for the projects and not the projects themselves. Afterall, you're the candidate for PMP, not those projects. For example:
. Completed phase 1 and 2 of the DR expansion project, transitioned to the next project manager for a successful rollout of 4-phase project.
. Completed the requirements gathering phase with the business and technical stakeholders, performed KT to the implementation PM for the remaining phases.
Again, just provide what was successfully achieved by you as the PM. If your application gets audited, PMI will ask you for proofs, will reach out to your previous manager or peers to validate the provided project outcomes done by you.
Good luck,
Luke