Complex sentence: He is a two-time Olympic Champion with Natalia Mishkutenok and Oksana Kazakova in 1992 and 1998 respectively, and also won Olympic silver in 1994.
Split into simpler sentences: He is a two-time Olympic champion, having won gold with Natalia Mishkutenok in 1992 and with Oksana Kazakova in 1998. He and Mishkutenok also won Olympic silver in 1994.