Radahn second phase tips

I have been fighting him for 2 hours and can easily get past phase 1. But phase 2 is where I struggle because the holy attacks follow physical one and break my dodge rythm plus the random AoE attacks take away half of my health. My friend says he is very easy 💀 I don't know how does he get to that conclusion but I need help (he can't he just says Radahn is easy). Any tips?