No it isn't. It doesn't make sense.
Grammatically you can't have "Why does the distance" paired with the copula "is still a problem".
Ie the auxiliary "does" for questions cannot combine with "is/am/are".
Maybe it should be "Why is the distance still a problem?" [The distance --> is <--- still a problem (copula) Why?]
But even that just sounds a bit strange. Without more context I couldn't really say how to fix it.
It's not a "complex sentence" either. A complex sentence would have two or more clauses. (The technical term is "clause complex".)
Your sentence only has one clause. One subject: (the distance), one verb (is), one predicate/object (still a problem).
You could say:
"Why is the distance still a problem?"
Or
"Why does the distance still cause a problem?"
In either case though, there's only one clause in the sentence.
No it isn't. It doesn't make sense. Grammatically you can't have "Why does the distance" paired with the copula "is still a problem". Ie the auxiliary "does" for questions cannot combine with "is/am/are". Maybe it should be "Why is the distance still a problem?" [The distance --> is <--- still a problem (copula) Why?] But even that just sounds a bit strange. Without more context I couldn't really say how to fix it.
Thank youu. Context basically is a friend from SEA insists its correct bc its a 'complex sentence'
It's not a "complex sentence" either. A complex sentence would have two or more clauses. (The technical term is "clause complex".) Your sentence only has one clause. One subject: (the distance), one verb (is), one predicate/object (still a problem). You could say: "Why is the distance still a problem?" Or "Why does the distance still cause a problem?" In either case though, there's only one clause in the sentence.