Complex sentence: He joined Tata Steel in 1989, was posted in Jamshedpur, and resigned in 1992, having previously taken leave of absence in order to study for the Civil Services Examination.
Split into simpler sentences: He joined Tata Steel in 1989 and was posted in Jamshedpur. Kejriwal resigned in 1992, having taken leave of absence in order to study for the Civil Services Examination.