Complex sentence: Thomas Hoffmann, was formerly known as Thomas Fechtner, and legally changed his name in USA on June 26,2012 to maintain the legacy of his mother, Irene Lorenc, originally born Irene Hoffmann.
Split into simpler sentences: Thomas Hoffmann, formerly known as Thomas Fechtner, legally changed his name on June 26,2012. He changed his name to maintain the legacy of his mom, Irene Lorenc, originally born Irene Hoffmann.