Complex sentence: The BCCI carried out a preliminary inquiry headed by Ravi Sawani, the ICC Anti-Corruption Unit's former chief and the current head of the BCCI Anti-Corruption Unit.
Split into simpler sentences: The BCCI carried out a preliminary inquiry, which was headed by Ravi Sawani. Sawani is the ICC Anti-Corruption Unit's former chief and the current head of the BCCI Anti-Corruption Unit.