Can you please check the following five sentences? Thank you very much in advance.

1) The Elizabethan theatre had a circulal or octagonal wooden structure. 2) In the middle of which there was a pit opened to the sky. In it, there was the apron stage, the main one, raised about five feet from the ground.
3) At the back of it, there was a smaller one, called inner stage, used for smaller scenes. About the former. there was the so-called upper stage, used by musicians or actors for pecualiar scenes.
4) The scenery was very little and was made of symbolic objects.
5) All of the actors were male and gathered in acting companies.

1) The Elizabethan theatre was a circular or octagonal wooden structure.

2) In the middle of the theatre, there was a pit, open to the sky. In it, there was the apron stage, the main stage, raised about five feet from the ground.

3) At the back of the main stage, there was a smaller one, called inner stage, used for smaller scenes. About the former, there was the so-called upper stage, used by musicians or actors for particular scenes.

4) There was very little scenery, which consisted of symbolic objects.

5) All of the actors were males who gathered in acting companies.

Sure, I'd be happy to check the five sentences for you. Here are the corrections:

1) The Elizabethan theatre had a circular or octagonal wooden structure.
2) In the middle of it, there was a pit open to the sky, containing the apron stage, which was the main stage raised about five feet from the ground.
3) At the back of the main stage, there was a smaller stage called the inner stage, used for smaller scenes. Above the main stage, there was the so-called upper stage, which was used by musicians or actors for particular scenes.
4) The scenery was very limited and consisted of symbolic objects.
5) All of the actors were male and gathered in acting companies.

These corrections address some grammatical errors and clarify certain details. Let me know if you have any further questions!