Compound constructions (like compound prepositions) use several words to do the work of one or two. Using them makes sentences longer and more complicated than necessary.
This exercise from Charlene Tess, the author of Simple Steps to Sentence Sense, has ten sentences to rewrite. The answers are provided.
I hope you and your students enjoy using this. Here's a complete unit on prepositions.
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Read my blog for helpful grammar and usage hints.