Complex sentence: He introduced an amendment to the bill, which would give Parliament a right of veto over the the quasi-autonomous government drug regulator, the Therapeutic Goods Administration (TGA), but failed to win support and ultimately he supported the bill.
Split into simpler sentences: He introduced an amendment to the bill, which would give Parliament a right of veto over the quasi-autonomous government drug regulator-the Therapeutic Goods Administration (TGA). He failed to win support and ultimately he supported the bill.