QUESTION: Fix punctuation: During the early Middle Ages had almost ceased trading in Europe north of the Mediterranean
ANS: During the early Middle Ages had almost ceased trading in Europe north of the Mediterranean.

QUESTION: Fix punctuation: When your consumption of cigarettes declines it is easier to quit smoking altogether
ANS: When your consumption of cigarettes declines, it is easier to quit smoking altogether.

QUESTION: Fix punctuation: The chests open in turn and 3 gems Diamonds or Emeralds or Rubies appear one by one If the three gems are of same type then the prize is awarded
ANS: The chests open in turn and 3 gems (Diamonds or Emeralds or Rubies) appear one by one. If the three gems are of same type then the prize is awarded.

QUESTION: Fix punctuation: MEP Modeler also has an associated library of MEP objects in GDL format that means even large and complex models are shown quickly in ARCHICAD Installation of MEP Modeler also expands ARCHICADs builtin object library so that washbasins and toilets get connections for installations
ANS:
MEP Modeler also has an associated library of MEP objects in GDL format that means even large and complex models are shown quickly in ARCHICAD. Installation of MEP Modeler also expands ARCHICADs built-in object library, so that washbasins and toilets get connections for installations.