tornaram-se

became

→ tornar
phrase Rare #38,036
became Used for a change of state or condition. It can also mean 'turned into' depending on context.
PO: Com o tempo, eles tornaram-se grandes amigos.
EN: Over time, they became close friends.

Logo, tornaram-se inseparáveis.

Therefore, they became inseparable.

Tornaram-se amantes.

They became lovers.

As árvores tornaram-se selvagens e perigosas.

The trees became wild and dangerous.

— O Senhor dos Anéis: As Duas Torres (2002)

Suas visitas tornaram-se menos frequentes conforme o tempo passava.

His visits became less frequent as time went on.

Ela e Ham tornaram-se os melhores amigos que se possa imaginar.

She and Ham became the best of friends.

— A História Pessoal de David Copperfield (2019)