In compound sentence, there are two independent clauses that are joined using a coordinator. While in complex sentence, there are two or more clauses with one essentially an independent clause while there can be on or more dependent clauses. The difference between compound and complex sentence is that there is no dependent clause in compound sentence and at least there is one dependent clause in complex sentence.
Universal themes appeal to people regardless of their backgrounds and differences. It's important for universal themes to be recognized and included in pieces of media & literature because they are stories anybody could relate to as well as learn from.
Examples:
For example, some universal themes in Harry potter are: