Sentence 1
Original: An albatross flies over the sea, landing only to eat or nest.
Is this correct? Yes. This sentence uses a compound verb phrase flies and landing after a comma to add information. It means the albatross flies over the sea and only lands to eat or nest.
Tip: When you have two actions at the same time, you can use flies (present tense) and landing (gerund) after a comma for a smooth, connected idea.
Sentence 2
Original: An albatross flies over the sea, landing only to nest.
Is this correct? Yes. This sentence is also correct. It means the albatross flies over the sea and only lands to nest.
Tip: If you want to be extra clear, you can add when or in order to for a slightly longer version (not necessary for a 6-year-old): ...landing only to nest when it is time to rest or ...landing only to nest in order to raise its chicks.