loro servissero

were needed, were useful, served

→ servire
serv serve + iss imperfect subjunctive + ero they conjugation
verb · 3rd-person plural, imperfect tense Rare #44,787
were needed, were useful This form is commonly used in clauses expressing what someone thought or believed was needed.
IT: Pensavo che servissero altri bicchieri.
EN: I thought we needed more glasses.
served In other contexts, this form can mean “served” (as in provided a service).
IT: Volevano che servissero ai tavoli.
EN: They wanted them to serve at the tables.
Conjugation of servire
SingularPlural
First servirmi —
Second — servirvi
Subjunctive imperfect
SingularPlural
Third servisse servissero

Pensavo ti servissero.

I thought you needed them.

— Suspiria (1977)

Credevo che ci servissero le armi, per conquistare la libertà.

I believed we needed weapons to win our freedom.

— RRR (2022)

Per questo il ministro mi ha mandato, pensava che servissero energie nuove.

That's why the minister sent me; he thought new energy was needed.

— Young Detective Dee - Il risveglio del drago marino (2013)

Lasciate gli attrezzi, nel caso servissero.

Leave your tools, in case they are needed.

— Vite vendute (1953)