Assuming from where they're into a tapered part with nut on end where the rotation takes place? They have tools for that. If you don't need to keep the tie rod intact, there's a forked tool that you drive in to separate the pieces. If you need to keep the tied rod and seal intact, they have a tool that is put over the rotation part and has a bolt that can be rotated to push the threaded part of the tie road out. Most auto parts stores would have these on sale or rental.
Be sure and precisely measure or could the # turns to remove the tie rod from the rod that goes between the wheels so that the alignment will be the same. This is after you have the other part extracted.
Ralph