Complex sentence: In 1964 Rosenberg was to be executed using the electric chair, he was granted a stay of execution shortly before it was to take place by Governor Rockefeller based on new laws of New York State that reduced the use of capital punishment.
Split into simpler sentences: In 1964 Rosenberg was to be executed using the electric chair. Shortly before it was to take place he was granted a stay of execution by Governor Rockefeller based on new laws of New York State that reduced the use of capital punishment.