Can relative clauses be combined with adverbial clauses other than if-clauses?


The following is from Michael Swan's Practical English Usage:



Relative clauses can also be combined with if-clauses in sentences like the following.


I am enclosing an application form, which I should be grateful if you would sign and return.



Then, can relative clauses also be combined with other kinds of adverbial clauses, for example since-clauses in sentences like the following?



It seems something is wrong with this PC, which barely a month has passed since I bought.





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