QUESTION: Fix punctuation: 14 pieces of white bands of UVstable plastic of three different sizes for all ropes with diameters ranging from 5 to 19 mm
ANS: 14 pieces of white bands of UV-stable plastic of three different sizes for all ropes with diameters ranging from 5 to 19 mm

QUESTION: Fix punctuation: Finale Ligure is now renowned as one of the coolest areas of Italy for the freeriding and mountain biking in general
ANS: Finale Ligure, is now renowned as one of the coolest areas of Italy for the free-riding and mountain biking in general.

QUESTION: Fix punctuation: Youre well and enjoy life because you arent owned
ANS: You're well and enjoy life because you aren't owned.

QUESTION: Fix punctuation: Arthur was educated at Loreto Convent where like his sister he showed considerable musical talent winning a prize for his playing of the piano
ANS:
Arthur was educated at Loreto Convent where, like his sister, he showed considerable musical talent, winning a prize for his playing of the piano.