Learn Spanish (Latin America): Él es el líder en quien el equipo confía. - He is the leader in whom the team trusts.

In English, we often put prepositions at the end of a sentence (like "the leader the team trusts in"). In Spanish, you can never end a phrase with a preposition. The preposition must always come right before the relative pronoun, which is why it becomes en quien (literally "in whom").

Wait, doesn't "to trust" translate directly? Why do we need the en?

In Spanish, the verb confiar (to trust) almost always requires the preposition en when you are saying who or what you trust. It helps to think of confiar en as meaning "to trust in" or "to rely on" someone.

Why doesn't quien have an accent mark over the 'e' here?

You only put an accent mark on quién when it is used in a question or an exclamation (like ¿Quién es él? - Who is he?). In this sentence, quien isn't asking a question; it's a relative pronoun acting as a bridge to describe the leader, so it doesn't take an accent.

If we were talking about multiple leaders, how would this sentence change?

Unlike the English word "whom", which stays the same whether singular or plural, the Spanish word quien has a plural form. If there were multiple leaders, you would use quienes: Ellos son los líderes en quienes el equipo confía.