I keep on running into this problem. I will have a parenthetical phrase (which is something set off by parentheses, rather like this, for those of you that do not know), but I need to include multiple sentences in it. The normal punctuation for a parenthetical phrase at the end of the sentence is:
Sentence (parenthetical phrase).
Note how the period is outside of the parentheses. But if you add two sentences:
Sentence (Phrase1. Phrase2.).
The double period doesn't look right. I also feel obligated to capitalize the first word within the phrase, where I normally don't with just one parenthetical sentence.
What is the correct way to punctuate sentences like this? Or are two sentences within one parenthetical phrase not permitted? Are they supposed to be separate sentences?