1. Because that will lead to an attributive clause. The relative words that guide the attributive clause have one of the biggest characteristics: they also act as a component in the clause. The subject of the attributive clause in this question is the relative pronoun that.

"Instead of George" is an infinitive verb phrase used as an adverbial of purpose.

The ability to understand others and the queen point to the same thing, they are appositive. These two appositives are the subject of the whole sentence.

The ability to understand others is a noun phrase centered on noun ability. Understanding others is a verb infinitive phrase, which acts as a post-attribute and modifies the ability.

Analysis of the whole sentence structure:

Empathy, the ability to understand others-appositive phrases as the subject;

Is- copula;

One of the most important things that many top companies look for in new managers is predication (what many top companies look for in new managers is attributive clauses, which modify things. )

Reference translation:

Compassion and the ability to understand others are one of the most important qualities. It is this quality that many senior companies seek when recruiting new managers.