Answer:
Shark attacks can be prevented, because although shark attacks are rare, swimmers should be careful.
Step-by-step explanation:
A compound-complex sentence is one of the lost complicated types of sentences because they contain at least two independent clauses and a dependent clause.
Therefore, the above given simple sentences have been joined to form the compound-complex sentence below, "Shark attacks can be prevented, because although shark attacks are rare, swimmers should be careful."