Formal:
* The years of research culminated in a groundbreaking discovery. (meaning the research ended with this important discovery)
* Their hard work and dedication culminated in a successful product launch. (meaning their efforts led to a successful launch)
* The negotiations culminated in a mutually beneficial agreement. (meaning the negotiations ended with an agreement that was good for both sides)
Informal:
* My day at the amusement park culminated with a thrilling ride on the roller coaster. (meaning the best part of the day was the roller coaster ride)
* Our weekend getaway culminated in a delicious dinner at a fancy restaurant. (meaning the highlight of the weekend was the dinner)
* The movie's plot culminated in a dramatic showdown between the hero and villain. (meaning the climax of the movie was the fight between the hero and villain)
Figurative:
* Her dreams of becoming a doctor culminated in her graduation from medical school. (meaning her dream finally came true with her graduation)
* Their love story culminated in a beautiful wedding ceremony. (meaning their love story ended with a wedding)
Remember that "culminate" implies a final or climactic point, so use it when something reaches a peak or completion.