Final answer:
The sentence in question is a simple sentence because it contains only one main clause with a single subject and verb expressing a complete thought, without any conjunction joining independent clauses or inclusion of dependent clauses.
Step-by-step explanation:
The sentence 'Pauline loves to go to the beach and spend her days sunbathing.' is a simple sentence. Despite having multiple actions described (going to the beach and spending days sunbathing), there is only one main clause that expresses a single complete idea, with 'Pauline' as the subject and 'loves' as the transitive verb. The actions 'to go to the beach' and 'spend her days sunbathing' are part of the predicate providing additional information about what Pauline loves to do.
However, since there is no conjunction joining two independent clauses, it does not form a compound sentence. It also lacks a dependent clause, which is necessary for a sentence to be complex or compound-complex.