Complex sentence: PricewaterhouseCoopers (trading as PwC) is the world's second largest multinational professional services network, as measured by 2014 revenues, and is one of the Big Four auditors, along with Deloitte, EY and KPMG.
Split into simpler sentences: PricewaterhouseCoopers (trading as PwC) is a multinational professional services network. It is the world's second largest professional services network, as measured by 2014 revenues, and is one of the Big Four auditors, along with Deloitte, EY and KPMG.