Complex sentence: After being found by a young Diane at the riverside, he awoke with amnesia, completely forgetting his initial goal to rescue Helbram, instead spending centuries together with Diane and becoming her best friend and lover.
Split into simpler sentences: After being found by a young Diane at the riverside, he awoke with amnesia, completely forgetting his initial goal to rescue Helbram. King instead spent centuries together with Diane and became her best friend and lover.