Complex sentence: For hundreds of years, the word "holocaust" was used in English to denote great massacres, but since the 1960s, the term has come to be used by scholars and popular writers to refer to the Nazi genocide of Jews.
Split into simpler sentences: For hundreds of years, the word "holocaust" was used in English to denote great massacres. Since the 1960s, the term has come to be used by scholars and popular writers to refer to the Nazi genocide of Jews.