Complex sentence: Wong is currently involved in a possible insider trading scandal of the Taiwan based biotech company OBI Pharma Inc. (浩鼎), formerly a subsidiary of Optimer Pharmaceuticals, which had since been purchased by Cubist Pharmaceuticals.
Split into simpler sentences: Wong is currently involved in a possible insider trading scandal related to a biotech company OBI Pharma Inc. (浩鼎) headquartered in Taiwan. The OBI Pharma company was formerly a subsidiary of Optimer Pharmaceuticals, which had since been purchased by Cubist Pharmaceuticals.