Add punctuation: The horizontal extent of the pollution plume changes during a yearly cycle but is considered to be in the order of 3040 meters downgradient from the source area
A: The horizontal extent of the pollution plume changes during a yearly cycle, but is considered to be in the order of 30-40 meters downgradient from the source area.

Add punctuation: Lloydas 30 years old United Kingdom
A: Lloydas , 30 years old, United Kingdom

Add punctuation: A gorgeous pair of Italian wall lamps sconces from the 1950s made of gilt metal Beautifully crafted with 5 light sources positioned in front of slim grasslike reeds with long slender leaves
A:
A gorgeous pair of Italian wall lamps / sconces, from the 1950's made of gilt metal. Beautifully crafted with 5 light sources positioned in front of slim grass-like reeds with long slender leaves.