Complex sentence: Somdej Phra Chao Yu Hua (สมเด็จพระเจ้าอยู่หัว) is restricted to a king who has not yet gone through coronation, normally precedes the king's name, but once crowned, he will use the title "Phrabat Somdej Phra Chao Yu Hua".
Split into simpler sentences: Somdej Phra Chao Yu Hua (สมเด็จพระเจ้าอยู่หัว) is restricted to a king who has not yet gone through coronation. Once crowned, he will use the title "Phrabat Somdej Phra Chao Yu Hua".