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The first thing that comes to mind is using a Marketo String field and adding a break tag (<br/>) between each account name in your list (the data itself can be synced down from SFDC or imported into MLM). When the email is rendered to the end user, each account name will be listed on its own line.
If you provide more information about the data source (list import, etc) and an anonymized example of the data, then we can check and test a more tailored solution.