Avoiding plagiarism without citing every sentence
You could quote a block literally and cite once. You could then use your own words to summarize if you think it needed. This separates your words from the original. 

For long runs of literal citations you could use indented blocks and block shading/coloring (if allowed) rather than just quote marks. 

You could also use the paragraph structure. Start a new paragraph with "We learn from AJ Smythe that" ... followed by your paraphrasing of good ol' AJ. Then end that paragraph with your citation(s). 

Think about what you would do if you had to provide a translation of Smythe from the original Hungarian instead of a paraphrase. Quoting with quote marks isn't quite the right thing, but indented blocks might be.