Comma confusion

Have I used the commas correctly, and is the sentence construction satisfactory (esp. article usage)?

With the growing popularity of the venue, the frequency of exhibitions and the drastic rise in the number of visitors to events led to the expansion of Earl’s Court One, with the addition of another single large hall, Earl's Court 2, which, too, was built with the provision of conference facilities. 

The growing popularity of the venue, the frequency of exhibitions, and the drastic rise in the number of visitors to events all led to the expansion of Earl’s Court One with the addition of another single large hall, Earl's Court 2, which was also built with the provision of conference facilities. 

Clive