Complex sentence: The success of 3G spectrum auction was a boost to the government as it was already bearing the brunt from the scam in 2G spectrum, that was auctioned before Thomas assumed the office of Telecom Secretary.
Split into simpler sentences: The success of 3G spectrum auction was a boost to the government as it was already bearing the brunt from the scam in 2G spectrum auction. The 2G spectrum auction was before Thomas assumed the office of Telecom Secretary.