In plain words
Sītā and Ūrmilā were both King Janaka's daughters. Janaka announced that he would give Sītā in marriage to the hero who strung Śiva's bow. Many kings came and tried. But none could lift Śiva's bow. Then, at Viśvāmitra's bidding, Rāma went, lifted Śiva's bow with ease and fastened the bowstring. He set an arrow to it and drew the bowstring back to his ear. With a great noise, it broke. The assembly, stunned with wonder, raised cries of victory.
Sītā stood ready to place the garland round Rāma's neck. But Rāma was not ready for the marriage. He bowed to Viśvāmitra: “Master! You brought us to guard the yajña, not for a wedding. Without our father's consent I will not agree to this marriage,” he said. Viśvāmitra was in a fix. Everyone in the assembly fell silent. “What is this, this boy is objecting to the marriage!” they wondered. King Janaka at once sent word to Ayodhyā. Hearing this happy news, King Daśaratha, Kausalyā, Sumitrā and Kaikeyī, Bharata and Śatrughna, and the people of Ayodhyā swelled with a joy they could not contain. All of them together came to the city of Mithilā in joy and high spirits.
Janaka's second daughter was named Ūrmilā. His younger brother had two daughters, Māṇḍavī and Śrutakīrti. King Janaka entreated Daśaratha to give his consent to the marriage of Ūrmilā to Lakṣmaṇa, Māṇḍavī to Bharata and Śrutakīrti to Śatrughna. “Very well, the four were born at the same time. So it is good indeed that all four be married at the same time,” thought Daśaratha, and gladly gave his consent. Grand arrangements were made for the wedding festival. As for the people of Mithilā, their joy knew no bounds.