Add punctuation: Vehicles are comfortable airconditioned and nonsmoking and always kept in perfect technical condition
A: Vehicles are comfortable, air-conditioned and non-smoking, and always kept in perfect technical condition.

Add punctuation: iii in person at the Event venue
A: (iii) in person at the Event venue.

Add punctuation: Its flowers are ballshaped and bloom in white pink or blue
A:
Its flowers are ball-shaped and bloom in white, pink or blue.