To build a message with multiple links from the clipboard, you need to have the World or Trade Chat page open in one tab or window. Then, open a profile and click the "copy to clip" button.
Then click the "paste from clipboard" button on the world or trade chat page. This allows you to put several in a row.
Alternatively, you can see the format for one of the pasted items (each uses a consistent format with the ID of the player or franchise, etc.). You can then manually add or edit multiple items in a chat message.