Complex sentence: In 1925--1927 burials in the ground were replaced with burials of cremated ash in the Kremlin wall itself; burials in the ground resumed with Mikhail Kalinin's funeral in 1946.
Split into simpler sentences: In 1925--1927 burials in the ground were stopped; funerals were now conducted as burials of cremated ash in the Kremlin wall itself. Burials in the ground only resumed with Mikhail Kalinin's funeral in 1946.