In plain words
The poet, singing Rāma of Kaṇṇapuram to sleep: O you who built a causeway with mountains and destroyed walled Laṅkā! O you who churned the billowing sea [the Milky Ocean] and graciously gave the nectar to the immortals! My dark gem of Kaṇṇapuram, where masters of all learning dwell! O master of the bow [Śārṅga]! O hero! Śrīrāma, tālēlō.