Revising vague use of it, this, that, and which

Writers often use it, this, that, or which as a shortcut for referring to something mentioned earlier. But such shortcuts can cause confusion. Make sure that these pronouns refer clearly to a specific antecedent.

If a that or which clause refers to a specific noun, put the clause directly after the noun, if possible.

Does that refer to the float or the parade? The editing here makes the meaning clear.