я был несколько удивлен, обнаружив

я был несколько удивлен, обнаружив в зале, где и должен был выступать, так много людей

Результаты (английский) 1:

I was somewhat surprised to discover in the Hall where and had to serve so many people

Результаты (английский) 2:

I was somewhat surprised to find in the hall, where he was to speak, so many people

Результаты (английский) 3:

I was a little surprised, once in the conference room, where and should have been to speak, so many people