Snoring is not something to just be put up with. It is a medical condition and he should be looking for ways to cure it or reduce the severity. A friend of a friend died of sleep apnea and that gave dh the push to take more responsibility.
However, at a base level his condition is having a detrimental effect on the family. None of us are at our best when we are running on less than healthy levels of sleep.
The thing is, even if it doesn't work, if your dp could at least show that he is trying to fix it then that will ease the resentment.
Is he overweight? Dh goes from between 13st and 14st. At lighter end, no snoring - the other...? Like a train!
Try changing pillows - higher or lower.
There is a horrible and expensive but effect snoring moose that dh has used successfully on occasion.
Get on the sofa, snuggle up with your dp and smart phone and research ideas to try. Try to forgive him, hopefully he will forgive you and get back on the same team. He isn't the enemy, he loves your dd too.