Complex sentence: The main sanctuary is large enough to hold about 1020 people the seats are place in a circular manner around the protruding pulpit, so that the people on one side of the synagogue can see the people on the other side.
Split into simpler sentences: The main sanctuary is large enough to hold about 1020 people. The seats are placed in a circular manner around the protruding pulpit, so that the people on one side of the synagogue can see the people on the other side.