Corrected sentence: Stars are very far apart from each other, but sometimes they seem to line up. Long ago, people connected them into pictures called constellations.
What I changed and why (easy words):
- I added "very" to show the stars are really far away.
- I added "from each other" to make it clear the distance is between the stars.
- I used "sometimes" because the stars only look lined up from where we stand.
- I moved "Long ago" to the start of the sentence to make it flow better.
Short explanation: Stars are at different distances in space, but from Earth they can look like they are on the same line. People long ago used their imaginations to draw pictures by connecting those dots of light. Those pictures are called constellations. Examples are the Big Dipper and Orion.