Complex sentence: Lord Suryanarayan's mother gave the plate on the condition that should the plate break, she will demand the hand of Randal Mataji in marriage for Lord Suryanarayan.
Split into simpler sentences: Lord Suryanarayan's mother gave her the plate on the condition that it be returned intact. Should the plate break, she will demand the hand of Randal Mataji in marriage for her son Lord Suryanarayan.