Complex sentence: He led the club to their first trophy in five years by winning the Cupa Ligii but, after advances from the Romanian Football Federation to coach the national team, he resigned from his post on 16 September.
Split into simpler sentences: He led the club to their first trophy in five years, by winning the Cupa Ligii. After advances from the Romanian Football Federation to coach the national team, he resigned from his post on 16 September.