Can em dashes be used to separate prepositional phrases? So that phrase is only used as to modify the noun directly before it, and to the rest of the sentence is non-existent.
- Truth is I — at my position in time — strive to succeed. [Em dashes are used to make clear that I strive, my position in time has nothing to do with me striving.]
- The pencil has yellow scrapes — which were made by Billy who has a multitude of diseases — which are concerning. [Em dashes are used to make clear that the scrapes are concerning. Not in any way is this sentence saying Billy's diseases concerning.]
- The alien looking man — with a red lizard that seems as if it might run—ran quickly. [Em dashes are used to make clear that the man ran, not the lizard (even those the lizard looks like it might run)]
Do the em dashes do what I say they do in the sentences? If yes, then the answer to this question would be yes. Otherwise the answer would be no.