The Zaire River through west-central Africa, which was known as the Congo River until 1971, flows.
Complex sentences are formed by using relative pronouns. The relative pronouns who, whom, whose, where, when, why, that, and how are a few examples. Where - A place is referred to. Who - Denotes an individual (the noun, pronoun, or subject that performs the action).
The winning cyclist put in a lot of training. My new pants from yesterday are already soiled. Whoever the committee chooses as the four team leaders, they will be present at tomorrow's meeting. We eat spaghetti at least twice a week, and it's one of our favorite dishes.
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Did you take that photograph with the digital camera?
        
             
        
        
        
Laughter enhances your intake of oxygen-rich air, stimulates your heart, lungs and muscles, and increases the endorphins that are released by your brain. Activate and relieve your stress response.
 
        
             
        
        
        
In "How the Animals Lost Their Tails and Got Them Back Traveling From Philadelphia to Medicine Hat" by Carl Sandburg, the main characters are animals and they are introduced in a comical manner. Sandburg uses literary devices; onomatopoeia, alliteration, and repetition.  
 
        
                    
             
        
        
        
Answer:
The children sailed paper boats before dinner. 
Mothers call the children inside when dinner is ready. 
She fell while she was playing and injured her knee.
Explanation:
Prepositional phrases are composed at least of a preposition and an object. 
The word 'when' used as a conjunction means 'at the time that', and is followed by a subordinate clause. 
The word 'while' is used to connect two events occurring at the same time, and is followed by a subordinate clause.