Add spaces: Thetopoftheshadeiscircular,thenitwidensintoasuperellipse.

Answer: The top of the shade is circular, then it widens into a superellipse.

Add spaces: SB14inBarcelonafromthe28thtothe30thofOctoberistheworld'slargestsustainableconstructionconference.

Answer: SB14 in Barcelona from the 28th to the 30th of October is the world's largest sustainable construction conference.

Add spaces: AmongthoseontheRockwasateenagegirl,Roxanne.

Answer:
Among those on the Rock was a teenage girl, Roxanne.