Complex sentence: She became mayor of Indore February 2015 by defeating her nearest rival Archana Jaiswal of Indian National Congress by 2.8 lakh votes thus became second woman to do so after Dr Umashashi Sharma.
Split into simpler sentences: She became mayor in February 2015 by defeating her nearest rival Archana Jaiswal of Indian National Congress by 2.8 lakh votes. Consequently, she became only the second woman to do so after Dr Umashashi Sharma.