How do you perform multiple rotations on the same object? - (in a single frame)

Hi,

I'm trying to perform the two following rotations on a single object without them conflicting:

• The player will rotate the character on the local Y axis using the camera. Allowing the player to run forward in the direction of the camera. (The camera is a child of the character)

• The artificial gravity will rotate the character to so that it's head points outward, from the center of the planet. The Y rotation is often changed to accomplish this.

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I can easily do either rotation but as soon as I try to perform both, everything fails horrendously.

Vector math and Quaternions have always given me a lot of trouble conceptually. Anyone willing to teach would be greatly appreciated!

Edit: I'm trying to combine this:

 var targetCharacterOrientation = Quaternion.FromToRotation(characterBody.transform.up, upDirection) * characterBody.transform.rotation;

With this:

 var yRotation = Quaternion.AngleAxis(_mouseAbsolute.x, targetCharacterOrientation * Vector3.up); 
 characterBody.transform.rotation = yRotation * targetCharacterOrientation;

The first rotation is changing the Y rotation value and so is the second (yRotation). I need to use X and Z from the first rotation but Y from the second. I tried using Euler angles but ran into Gimbal lock.