There were more people than I expected and I was excited.
I was excited that the audience was larger than I thought it would be.
There were more people than I expected and I was excited.
想像していたより人が多くて興奮しました。
I was excited that the audience was larger than I thought it would be.
思っていたより観客が多くて興奮しました。
上記のように英語で表現することができます。
more than I expected / larger than I thought はここでは「思ったより(観客が)多かった」という意味の英語表現です。
お役に立てれば嬉しいです。