Kathañca, mahaaraaja, bhikkhu siilasampanno hoti?
and how / great king / monk / accomplished in discipline / is
O great king, and how is a monk accomplished in discipline?
kathañca = katha.m + ca : and how?
mahaaraaja = mahaa + raaja : great king.
siilasampanno = siila + sampanno : accomplished in discipline
hoti (verb to be) is.