The shock clevis bolt and nut corrode and seize together. Its very common to have difficulty removing the bolt to get the clevis separated from the LCA.
There is no way to get the driveshaft into place without separating them, unless you want to completely disassemble one of the CV joints at the end and re-assemble it after putting just the shaft through the clevis. If you don't have the special tools for the boots, and contaminate the special grease inside the CV joint, or get dirt inside the internals while you have it all apart, you'll end up worse off with a compromised CV half-shaft that might NOT last.
Some things that work to get that Clevis Bolt out. Soak it with penetrating oil, give it time to soak in, let it soak overnight. Once you get the nut off, soak it again with penetrating oil. Use a sledge to drive out the bolt, if it only moves a fraction of an inch, then use a wrench to turn the nut back and forth, breaking it free from the corrosion seizing it to the collar in the bushing. Pound on it again with a sledge, and keep repeating the soaking in penetrating oil, turning back and forth with a wrench, pound with a sledge, till you get it all the way out.
Some people (that live in salt states where underside corrosion is really bad) have had to cut the bolt off, then remove the LCA to have the bushing pressed out and a new one pressed in, and get a new bolt and nut.
Before you risk damaging or cutting the shock clevis, check with your Dealer to see if they can get a replacement part. A few months ago, someone posted that they had a Dealership replace their shocks, the Dealership damaged the Shock Clevis and then found out the Shock Clevis was on 6 month back order and its a Dealer only part. The Dealership told him his Commander would just have to sit and NOT be driven for 6 months.