Simple Sentences:
* The room in which we met was small and cozy.
* The book in which she found the answer was very old.
* The year in which the war began was 1939.
Complex Sentences:
* The city in which I grew up is no longer the same.
* The reason in which she left was never fully explained.
* The time in which we live is filled with uncertainty.
Sentences with Embedded Clauses:
* The movie, in which the actor gives a stunning performance, was nominated for multiple awards.
* The story, in which the protagonist faces many challenges, is a classic tale of adventure.
* The painting, in which the artist captures the beauty of the sunset, is a masterpiece.
Sentences with Prepositions:
* The box in which she kept her jewelry was hidden under the bed.
* The house in which they lived was built in the 18th century.
* The town in which she was born is a small village nestled in the mountains.
Remember, "in which" is used to introduce a defining relative clause, which provides essential information about the noun it modifies. It can be used in various ways, adding complexity and depth to your writing.