In plain words
Destroying these guṇas of rajas and tamas, He crowned Vibhīṣaṇa, who is the sattva guṇa. Then He saw Sītā, who is Jñāna known by experience. By the time Sītā, who was Brahmajñāna, became Jñāna known by experience, He entered Ayodhyā. In this way the principle of the Rāmāyaṇa has been making its journey in every human being too, through such guṇas, through behaviour and through natural feelings.
Now, about Laṅkā. Daśakaṇṭha is its king. This Daśakaṇṭha, though he had every power, was ever sunk in delusion. His name is Daśagrīva. If Ayodhyā has Daśaratha, Laṅkā has Daśagrīva. Daśaratha is the one who has the ten senses as his chariot. This Daśakaṇṭha is the one who tries to enjoy the ten senses. However much learning one has, however much strength of intellect, of arm and of people, one who has no control of the senses becomes the lowest of the low. One without control of the senses, though one conquer the three worlds, cannot conquer one's own nature. The human birth of one who cannot master oneself and cannot conquer oneself is of no use. In this Laṅkā, Rāvaṇa's qualities spread in many ways. Yathā rājā tathā prajā. While the king himself, a slave to the senses, enjoyed sensations of many kinds, the people too followed him. So the whole of Laṅkā was filled with this slavery to the senses. They did not understand what humanness is. Divinity they did not understand at all. Demonic nature alone was their nature. Eating, drinking, enjoying the senses. But mechanically they kept up worship, vows, yajñas and yāgas of many kinds. From daybreak, in these flames of fire, homas went on in every street, in Laṅkā. Rāvaṇa shaped the city of Laṅkā to be more beautiful than heaven. Hanumān, knowing that this Rāvaṇa had carried off Sītā, entered Laṅkā, and when he looked over that Laṅkā once: “Chī! Rāvaṇa did not carry off Sītā like this. Someone else may have carried her off. This man ought to be living in Indra's world. Indra has no qualities like these,” and a kind of doubt arose in him. In every street a yajña is going on. Every person is chanting Vedic mantras. Look at the town: it is supremely clean, like a mirror. Would the king of such a city enter on such wickedness? So Hanumān did not believe that Rāvaṇa was wicked. Hanumān saw this city of Laṅkā, full of such beauty.
Joyful streets upon streets, ivory halls, mansions in every quarter, moon-faced women making merry, how many delights of women's play!
Hanumān saw all the mansions full of such loveliness. Wherever he looked, lovely gardens and flowers.