Your original sentences are very close to being correct! Here's a slightly improved version:
Original: An albatross spends most of its life flying over the ocean. Every year, they come back to the same shore where they hatch chicks.
Corrected: An albatross spends most of its life flying over the ocean. Every year, it comes back to the same shore where it hatches chicks.
Explanation:
- The word "albatross" is singular (talking about one bird), so we use "it" instead of "they" to match.
- The verb changes to "comes" instead of "come" because "it" is singular.
- Similarly, "hatches" ends with an "es" in the third person singular present tense.
This way, the sentences are grammatically correct and easy to understand!