Even if your sentences are grammatically correct, they could still need some work. Repeating identical sentence structures will make your paragraphs sound stiff and unsophisticated. The following links can help you understand how to vary your sentence structure.
Sentence Variety
Why should I have a variety of sentence types in my paragraphs?
Learn to identify sentence patterns
How to combine sentences: this older-looking site offers easy-to-understand strategies for combining sentences as it defines its key terms
Parallelism and Modifiers
Faulty parallelism and misplaced modifiers make sentences difficult to read.
Parallel sentence structure: overview and rules
University Writing Center
