Complex sentence: The Other Place, a Black box theatre, was extended to become the temporary RSC Courtyard Theatre, opening in July 2006 and was the home of the RSC while the RST was being refurbished; its interior is similar to the interior of the refurbished RST.
Split into simpler sentences: The Other Place, a Black box theatre, was extended to become the temporary RSC Courtyard Theatre, opening in July 2006. This theatre was the home of the RSC while the RST was being refurbished; its interior is similar to the interior of the refurbished RST.