Passphrase help

Hi all - looking for some support. I'm trying to figure out a way to crack passphrases and can't just get it right. I figure by now someone has figured out the command line, so I'm asking if anybody has, would you mind sharing it below?  

I'm looking for a way to get, for example, "This is my password" - just a few words separated by special characters.   Thanks for any help!