Complex sentence: Citigroup had the world's largest financial services network, spanning 140 countries with approximately 16,000 offices worldwide and holds over 200 million customer accounts in more than 140 countries.
Split into simpler sentences: Citigroup had the world's largest financial services network, spanning 140 countries with approximately 16,000 offices worldwide. It holds over 200 million customer accounts in more than 140 countries.