There are many pretty girls who enter that company and end up quitting soon after, because they get married.
So, there were many people who wanted to be in that slot from the beginning.
ご質問ありがとうございます。
"There are many pretty girls who enter that company"＝「その会社に入社する人達には綺麗な子が多く」
"and end up quitting soon after,"＝「そして結局すぐ辞めてしまう」
"because they get married."＝「結婚のために。」
"So, there were many people"＝「なので、多くの人がいた」
"who wanted to be in that slot from the beginning."＝「最初からその枠に入りたい人が。」
ご参考に。
アメリカ合衆国 
