Complex sentence: In his final year in office, Prime Minister Jean Chrétien announced that the building would become home to a new museum of Canadian political history, but incoming Prime Minister Paul Martin cancelled this project, and it has remained a conference centre.
Split into simpler sentences: In his final year in office, Prime Minister Jean Chrétien announced that the building would become home to a new museum of Canadian political history. Incoming Prime Minister Paul Martin cancelled this project, however and it has remained a conference centre.