What does however tell readers about the sentence it introduces

The sentence it will introduce will be contrasting to the sentence(s) before that.

Explanation:

E.g. I woke up late. However, I got to school on time.

["However" here contrasted the idea that "I" might be late for school since "I" woke up late]

explanation:

the silver bells of the sleds are merry and keep time in the winter nights while the sky twinkles happily. the golden bells of weddings are delightful in their peaceful happiness, foretelling a rapturous future. meanwhile, the brazen alarm bells scream frightfully in the night, with a discordant and desperate sound. in their clamor, these bells convey terror, horror, and anger. finally, the iron bells are solemn and melancholy, while those in the church steeple are like ghouls who feel happiness. the king of the ghouls, who rings the bells, cheerfully keeps time with the moaning and groaning bells.

its c because its his point of view