Complex sentence: In 2005 the Jacaranda was added to the list of historic or environmentally significant trees in the City of Sydney and in 2012, the city's chief arborist placed it in the Register's Top 10.
Split into simpler sentences: In 2005 the Jacaranda was added to the list of historic or environmentally significant trees in the City of Sydney. In 2012, the city's chief arborist placed it in the Register's Top 10.