Start with explaining clearly and explicitly what you're actually trying to do, like "from this time to that time, and when humidity and temperature is like that, switch on/off".
Get your formatting right (use ctrl-T in the IDE) and enclose every block in {} for extra visual help on what's going on. This code: Between 0:00 and 15:59 you set your relay LOW if t > 32 or h > 72, and within that time, if it's between 16:00 and 23:59 (which of course can't happen) and if t < 28 and h < 68 you switch the relay HIGH. So your relay may get switched LOW but can never get switched HIGH.
Using explicit variable names like "hour", "temperature" and "humidity" rather than "p", "h" and "t" also helps a lot to understand your own code.