Complex sentence: In the 1970s she remarried, to Yuri Ivanovich Ivannikov (born 1950), an economist and had a son, Grigory Yurievich (b.1979).
Split into simpler sentences: In the 1970s she remarried, to Yuri Ivanovich Ivannikov (born 1950), an economist. They have a son, Grigory Yurievich (b.1979).