Kyoo (zyuku-de) kodomotati-{ga | no} narat-ta rekisi-wa Heianzidai-nituite-dat-ta .
today (cram.school-at) children-{Nom | Gen} study-Pst history-Top Heian.period-about-Cop-Pst
The history that the children studied at a cram school today was about the Heian period.