Complex sentence: After the Korean war ended, the Japan Self-Defense Forces were formed, and Japan Maritime Self-Defense Forces ships began to homeport in Sasebo, the U.S. Fleet Activities continued to support ships of the U.S. Seventh Fleet.
Split into simpler sentences: After the Korean war ended, the Japan Self-Defense Forces were formed, and Japan Maritime Self-Defense Forces ships began to homeport in Sasebo. The U.S. Fleet Activities continued to support ships of the U.S. Seventh Fleet.