Complex sentence: Tulasamma is really a police officer who was a colleague and friend of Priya's brother-in-law DIG Benarjee (Devan) kills Nana's (Devaraj) brother and arrests Nana.
Split into simpler sentences: Tulasamma is really a police officer who was a colleague and friend of Priya's brother-in-law DIG Benarjee. Benarjee kills Nana's (Devaraj) brother and arrests Nana.