1) Theretofore, he had always used a pen to write, but now he preferred typing.

2) The company had a strict policy theretofore, but decided to make some changes.

3) The restaurant had theretofore been known for its impeccable service, but there were recent complaints.

4) She had always been the top performer theretofore, but this year someone else took the lead.

5) The old law had been in effect theretofore, but was repealed.

6) Theretofore, he had never tried sushi, but now it was his favorite food.

7) The team was undefeated theretofore, but they finally lost a game.

8) Theretofore, she had been an unknown artist, but her latest exhibit brought her fame.

9) The road had always been treacherous theretofore, but new safety measures were implemented.

10) Theretofore, the town had never experienced a tornado, but one hit unexpectedly.