Off the cuff, you'll need to create two local variables in the Rule. Call them 'temp' and 'hum'.
Trigger: Motion active
Actions:
Set 'temp' to 'sensor temp reading'
Set 'hum' to 'sensor humidity reading'
Speak on speaker: "Current temperature is %temp% and current humidity is %hum%"
See if this helps. This rule keeps track of the temperature and when it changes announces the new temperature and the trend in my study, if I'm in there (the lights are on.) You can adapt the approach for your use. I have a temperature/humidity sensor in the backyard in a solar radiation shield that I use for hyperlocal weather conditions.
That, unfortunately, won't work here since they are wanting to use the motion sensor as the trigger. In that case, the %value% variable would be active/inactive.
@Lmartinez
This should work. You need to create the 'humVar' and 'tempVar' local variables.