Complex sentence: The Mehras adopted the name Mehrotras east of Delhi whereas those in regions west of Delhi adpoted the name Malhotra whereas in Kumaon from where this family group originated the name Mehra is used exclusively.
Split into simpler sentences: The Mehras adopted the name Mehrotras east of Delhi whereas those in regions west of Delhi adpoted the name Malhotra. Within Kumaon from where this family group probably originated the name Mehra is used exclusively.