Complex sentence: Mr. Ayyangar joined Madras civil service in 1905, first serving as Deputy Collector from 1905-1919, then as Collector and District Magistrate in 1920.
Split into simpler sentences: Mr. Ayyangar joined Madras civil service in 1905. He began as Deputy Collector from 1905-1919, and then rose to Collector and District Magistrate in 1920.