Complex sentence: Exits E1 and E2 are being rebuilt as one exit to accommodate the glass roof of the interchange concourse; this new exit E will not open until the Sha Tin to Central Link platforms open.
Split into simpler sentences: Exits E1 and E2 are being rebuilt as one exit to accommodate the glass roof of the interchange concourse. This new exit E will not open until the Sha Tin to Central Link platforms open.