Complex sentence: On July 22,2001, he became the youngest Union Minister, when he was made Union Minister of State for External affairs, a post he resigned from on December 23,2002, to concentrate on party work.
Split into simpler sentences: On July 22,2001, he became the youngest Union Minister, when he was made Union Minister of State for External affairs. He resigned from the post on December 23,2002, to concentrate on party work.