Complex sentence: Sergei Ratnikov (born 21 November 1959 in Pärnu) is a retired football midfielder from Estonia, and current manager of Estonian Esiliiga team JK Tallinna Kalev.
Split into simpler sentences: Sergei Ratnikov (born 21 November 1959) is a Estonian professional football manager and former player. Ratnikov is the current manager of Estonian Esiliiga team JK Tallinna Kalev.