Simplify the following text for a Grade 9 native English-speaking person.
Original: The east wall of the antechamber is interrupted by a large opening flanked by representation of Osiris at left and Anubis at right ; this in turn leads to the side chamber , decorated with offering scenes , preceded by a vestibule in which the paintings portray Nefertari being presented to the gods who welcome her .
Simplified: The east wall of the antechamber is interrupted by a large opening with paintings of Osiris and Anubis . This leads to the side chamber , decorated with offering scenes .