Complex sentence: The conditions of the will were met in 2010 after the 1989 death of his last grandchild, and in May 2011 his heirs, none of whom were alive when Burt died, finally received his fortune of about $100 million.
Split into simpler sentences: The conditions of the will were met in 2010 after the 1989 death of his last grandchild. In May 2011 Burt's descendents, none of whom were alive when he died, finally received the estate of about $100 million.