Improve the grammar of the given text.
It was a dull and boring morning, the sky was grey and the school it was empty
It was a dull and boring morning; the sky was grey and the school was empty.
Complete the following task based on the instruction and optional input provided.### Instruction:
Improve the grammar of the given text.

### Input:
It was a dull and boring morning, the sky was grey and the school it was empty

### Output:
It was a dull and boring morning; the sky was grey and the school was empty.