Final answer:
A prepositional phrase is a group of words that begins with a preposition and usually ends with a noun or pronoun. A complex sentence contains an independent clause and at least one dependent clause. Lastly, a simple sentence consists of just one independent clause.
Step-by-step explanation:
A prepositional phrase is a group of words that begins with a preposition and usually ends with a noun or pronoun. For example, in the park or with my friends are prepositional phrases. A complex sentence contains an independent clause and at least one dependent clause. For instance, Although it was raining, I went for a walk is a complex sentence. Lastly, a simple sentence consists of just one independent clause. An example of a simple sentence is The dog barked loudly.