Grammar Tips  

Commas and semi-colons. If the rules you learned about commas and semi-colons don't mean much to you, forget them and try this: Read one of your sentences aloud and see where you would naturally pause, where you would draw a breath. If it's a short pause, like that just was, you probably need a comma. If it's a longer pause, but not quite a full stop (for which you'd need a period), you probably need a semi-colon; remember that whatever follows a semi-colon must be able to stand on its own, as a full sentence, like this one.

Check your dashes and hyphens. When you're setting off a clause—this one is a good example—use the longer dash, called an m-dash. (You can indicate this dash with two hyphens—like this—if you don't have an m-dash function on your computer.) Be sure that the parts of the sentence that precede and follow the dashes would make sense even if you removed the dashes and the words they bracket. (In the example above, the sentence is readable with or without the clause inside the dashes.) 

Try to avoid split infinitives. This is no longer a hard and fast rule, and occasionally keeping an infinitive together in a sentence can introduce more awkwardness than the split, but usually the split is ungraceful.

Make sure all your referents are clear. When you say "This theory" or "that point" or, simply, "it," is it clear which theory or point you're referring to? When you use "he" or "she" or "these critics," will your reader have to pause to figure out who all these people are?