Complex sentence: In "Doomsday," he again acquired the Power Cosmic in the series finale and once again tries to go after Galactus only to hit the barrier that prevents the Silver Surfer from leaving Earth.
Split into simpler sentences: In "Doomsday", he again acquired the Power Cosmic in the series finale. He once again tries to go after Galactus only to hit the barrier that prevents the Silver Surfer from leaving Earth.