Question

This is done.This cannot be undone change into complex sentence ​

Answer 1

If This is done then this cannot be undone

Hope it will help you ❤️

Answer 2

Answer:

This is done which cannot be undone

Explanation:

Complex sentence contains two types of sentence i.e Main Clause and Subordinate Clause

This is done - Main Clause

which cannot be undone - Subordinate Clause