In a sentences like this:
I know people who are good at this and who can help you.
I can drop either the second who or and the sentence will still be ok and make sense. I can't drop them both though. I'm pretty sure about it. Correct me if I'm wrong
What I'm not sure about is this kind of sentence because we've got 2 kinds of relative clauses
I can name a few people who I'm friends with who got a job in that company.
Does it sound ok and correct?
Best Answer
There is a complication in using multiple relative clauses that is semantic rather than syntactic in nature. Your first example involves serial, coordinated relative clauses. I've chosen examples I prefer to work with:
I'd say this pairing of clauses would in most contexts be too semantically disparate to work.
This works better, the contrast being acceptable. These are {people who both work with toddlers and attend karate classes}
Here, the second clause follows on naturally from the first. If the optional therefore is included, the first clause is of course non-optional.
In the following examples, the serial clauses would not work:
It doesn't make sense to serialise such disparate statements
ie there are only {a few who know all about the problem}, and I've met them all: 'who I've met' is a parenthetical
ie amongst {the people I've met}, a few know all about the problem.
Looking at your second sentence,
is again a coordination.
But in your
there is not coordination, but sub-setting (nesting of clauses):
cf
The 'who' can't be dropped in 'standard British English' in the first of these two sentences, and dropping it in the second sounds like an informal AmE usage.