Complex sentence: In 1992, postmortem psychiatric examination of Grigorenko was carried out and described by the "Nezavisimiy Psikhiatricheskiy Zhurnal" in its numbers 1--4 of 1992.
Split into simpler sentences: In 1992, postmortem psychiatric examination of Grigorenko was carried out. It was described by the "Nezavisimiy Psikhiatricheskiy Zhurnal" in its numbers 1--4 of 1992.