Complex sentence: A postmortem shows that Simon was killed by a bomb hidden in a belt given to him by his kidnappers: the bomb was set off by a miniature detonator--minidet--found only in the Soviet space programme.
Split into simpler sentences: A postmortem shows that Simon was killed by a bomb hidden in a belt given to him by his kidnappers. The bomb was set off by a miniature detonator--minidet--found only in the Soviet space programme.