Currently our bathroom light/fan combo is running on one switch. Want to change to two single-pole switches. One to run the fan and one to run the light. There are only one black, one white and a ground coming from the light/fan unit. Is is possible for me to change to two switches? FYI- there is a double box because I changed the box before doing the switches assuming I would be able to do it. 
Electrical – switch the bathroom light and fan separately with two conductors
bathroomelectricalwiring
Related Solutions
No way from here to know which wire fed the light or fan, but you have a continuous hot feed into the box that fed the receptacle, light and fan. The third wire, maybe it fed the fan or maybe something something else farther down the line, if the latter that needs to be tied in 100 percent to the hot feed. All whites still tied together, blacks to the dimmer from the light and hot. All grounds tied together set with a screw to the metal box. Securing the ground to the box is not needed if the box is plastic.
Before I got too wordy, here is a sketch
Still have to learn to format better
The sketch is a little rough, it should get the idea across I hope
From an edit, of all things:
The wiring was as the commenters suggested (one switch going to the light/fan and one switch for an outlet in the room). I hired an electrician to come change it so one switch works the fan and one works the light on the fan.
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Best Answer
Yes, but you'll need smart devices to do it
In the smart-switch wiring, you also have a controller module up in the fan assemblt. The smart switch and controller both get always-hot and neutral. The controller then outputs switched-hot-fan and switched-hot-light.
The smart switch and controller must be a matched set. You probably won't need a 2-gang box for the smart switch.