Tore means to cause something to tear or rip into shreds like a whole becoming several parts.
"The dog tore my school uniform!"
Torn is the past participle of the word, tear which means to cause something usually paper or fabric to rapidly become two parts.
"The Suit remained torn since no one would fix it."
‘Tore’ is the past tense of tear, meaning to rip something.
“I had to get a new piece of paper because I accidentally tore the other one.”
‘Torn’ is the adjective that means it has been ripped.
“The old book had many torn pages and a stained cover.”