Complex sentence: This was seen as the primary reason for a relatively low attendance for the second edition of the festival which was estimated to be around 17,000 as opposed to 40,000 in 2007 when Iron Maiden played in Bangalore for the first time.
Split into simpler sentences: This was seen as the primary reason for a relatively low attendance for the second edition of the festival. Attendance was estimated to be around 17,000, as opposed to 40,000 in 2007 when Iron Maiden played in Bangalore for the first time.