It happens when a person has Plain Text emails turned on instead of HTML emails. There is no way to format a link to look pretty if it is plain text and since we track every click in every email, those links are long and ugly. Normally, it would look like this:
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Great connecting with you. Click the link below and I'll send you the info.
Thanks!
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The vast majority of people receive email in HTML format. While we wish there was a way around this for Plain text, we would either have to get rid of the tracking function or disallow plain text (which affects delivery rates). There is a tradeoff no matter how you slice this particular issue.