Question

We left the school at the stroke of the last bell
(change this sentence to complex with adverb clause)​

Answer 1

=》We left the school after the stroke of the last ball.

=》'After' is an Adverb clause.

Answer 2

$\huge\pink{AnsWeR}$

We left the school after stroke of the last bell.

After is adverb clause.

$<marquee>$

$\huge\purple{Hope\:It\:Helps!!}$