Answer:
Compound-complex.
Explanation:
The sentence is compound-complex because it both coordinates and subordinates elements. Firstly, the clause "that revealed increased awareness of child safety issues was encouraging" is a dependent clause, meaning it cannot stand on its own. This is why it is headed by the relative pronoun that and subordinated to the noun phrase "The survey"; together, they result in a complex sentence (from "The survey" up to and including "encouraging.")
In addition, this first idea is linked to a second idea expressed in a simple independent clause, "many parents still seek more government action," through the coordinating conjunction but, which links them together; this makes the resulting sentence a compound-complex sentence. As you can see, compound-complex sentences include more than one independent (or complete) clause and at least one dependent (or subordinate) clause.
