Sentence:  This, he argues, was in turn especially strongly shaped by imported British theatre traditions, particularly the use of the proscenium arch stage which was radically different from the open <WSD>staging</WSD> of precolonial and early colonial India and produced and emphasis on frontality in theatre productions that is now deeply structured into Bollywood films, most notably in their smile-at-the-camera song-and-dance sequences. 
Meaning of the word marked with <WSD> tags:  The scenery and/or organization of actors' movements on stage.