if i went to saunvare what would happen to me
Well, first off, you would suddenly weigh 90% more than you do here on earth, so that would be a big bummer no matter where you were on the planet. Another big bummer is the high methane and helium content in the atmosphere, so your voice would be permanently high. Finally, depending on where you were on the planet, you would either die of heat stroke in the 65°C tropics or otherwise find it very hot basically anywhere you went. So basically visiting Saunvare is pushing the human body to its limits.
do you think saunvare is capable of having advanced civilizations form on it?
Well, it does have all the ingredients that Earth does, including a magnetic field along with atmosphere, oceans, rain, etc, but any civilizations would have a very hard time getting into space because of the oppressively thick atmosphere (3992mb sea level pressure) and the intense gravity (1.9 Gs)