Complex sentence: Following fitting out at Tacoma, "Antelope" moved to her first home port, San Diego, whence she conducted shakedown training and operational tests before entering the Long Beach Naval Shipyard for post-shakedown availability.
Split into simpler sentences: Following fitting out at Tacoma, "Antelope" moved to her first home port, San Diego. After shakedown training and operational tests she entered the Long Beach Naval Shipyard for post-shakedown availability.