Complex sentence: In 2005, Sears introduced a new store format called Sears Essentials; some Kmart stores were converted to Sears Essentials, as well as a few locations that were acquired from Walmart and several bankrupt discount retailers.
Split into simpler sentences: In 2005, Sears introduced a new store format called Sears Essentials. As part of this new store format, some Kmart stores were converted to Sears Essentials, as well as a few locations that were acquired from Walmart and several bankrupt discount retailers.