Historical information can only be importing doing a full Jira import. The csv files don't have that information, comments and attachments are not exported.
If you want to import just a couple of Projects I recommend doing a full export / import and then deleting the unwanted projects. Note that this will overwrite all your previous Jira data.
If you are looking into importing a Project into an already working Jira without overwritting, then you'll have to do a merge between the Jiras. This article explains: How to merge two Jira OnDemand instances
Does the CSV contain the historical comments?
Isn't the other system listed on this issue trackers importer list: https://www.atlassian.com/software/jira/importer-migrations#%21jira-csv?
This was previously asked in https://answers.atlassian.com/questions/83849/issue-history-import-csvand maybe that helps.
More information about CSV importing is in Importing Data from CSV and there are also some questions and answers on that page.
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