Here’s an example of a sentence that correctly uses punctuation with a subordinating conjunction:
"Although it was raining, we decided to go for a hike."
In this sentence, the subordinating conjunction "Although" begins the dependent clause "Although it was raining," which is followed by a comma before the independent clause "we decided to go for a hike."
If you have specific sentences you'd like me to evaluate for punctuation, feel free to share!