Add punctuation: It wasnt until 29th September 1991 that the 35th Formula One Spanish Grand Prix took place here after 16 years of absence in Catalunya
A: It wasn't until 29th September 1991 that the 35th Formula One Spanish Grand Prix took place here, after 16 years of absence in Catalunya.

Add punctuation: Description A herd of wildebeest grazing in the late evening
A: Description: A herd of wildebeest grazing in the late evening

Add punctuation: Pon also chose to equip the Associations machines with Engcons DC2 control system and MIG2 joysticks
A:
Pon also chose to equip the Association's machines with Engcon's DC2 control system and MIG2 joysticks.