Hi Sasha, Here is an example for you: The boy, who fainted at the moment when he saw the accident, is recovering in the hospital. "who fainted....accident" (Adjectival clause / relative pronoun "who") "when he saw ... accident" (Adjectival clause / relative adverb "when")

This can be done in English when you have a non essential adjective clause after an essential adjective claus, at the end of the sentence or statement. Most commonly by using the word "which". That has to be offset by a comma according to many references. "I really enjoyed that (meal), which you did not" "I liked that steak, which you did not" "I rather liked that, but which you did not" "I will always do that, which you will not". Maybe these are not very common sentences. Or totally modern and current ? This video here on youtube explains it very well using natural easy to understand language. https://www.youtube.com/watch?v=KAIvcMDC684 This sentence I adapted from the video. "Teachers are people that I really respect, which you do not". every day spoken English "I respect teachers, you don't" no comma in the essential adjective claus, but it is offset by a comma in the non essential clause in accordance with some references and sources. The video that follows on youtube on autoplay, is also good but I think the first teachers explains better using more natural language to explain. https://www.youtube.com/watch?v=YsRphVUBuC0

My car, which has 6 cylinders that can produce 300 horsepower, is fast. Like that? I had to look up to know what an adjective clause was, and I know nothing about car. It's only an example.

There will be a competition coming right after your birthday which I like the most. The last clause is a nonessential adjective clause. But you still have to wait for natives.