If I'm correct in thinking the play is "Romeo and Juliet", then Mercutio is related by being a character in said play. Hope this helps.
Since nothing is underlined i presume that the underlined pronoun is them. It is in the dative case because them is an object and answers the question to whom was something done. Them refers to the trainer's team.
Answer:The science of life extension has one main goal, which is to prolong the human lifespan while maintaining youthful health. Since antiquity, people have pursued this goal through countless medicines, diets, and scientific procedures. But now, science has the knowledge to possibly make life extension a reality
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