Complex sentence: It was increased to 14% for transactions that happened on or after 1 June 2015 and then for transactions that occurred on or after 15 Nov 2015, the new "Swachh Bharat" Cess at 0.5% was also added to the Service Tax.
Split into simpler sentences: It was increased to 14% for transactions that happened on or after 1 June 2015. And then for transactions that occurred on or after 15th Nov 2015, the new "Swachh Bharat" Cess @ 0.5% was also added to the Service Tax.