DEFINING
In the 1980s, Alexey Pajitnov created a computer game. He called it Tetris.
In the 1980s, Alexey Pajitnov created a computer game WHICH he called Tetris.
In the 1980s, Alexey Pajitnov created a computer game THAT he called Tetris.
Marie Curie is famous for researching radioactivity.
She won two Nobel prizes.
Marie Curie, who won two Nobel prizes, is famous for researching radioactivity.
Albert Einstein developed a theory of energy. He called it the theory of relativity.
Albert Einstein developed a theory of energy WHICH he called the theory of relativity.
Albert Einstein developed a theory of energy THAT he called the theory of relativity.
Thomas Midgely has been described as the most dangerous man that ever lived.
His inventions included putting lead (plomo) into petrol.
Thomas Midgely, whose inventions included putting lead into petrol, has been described as the most dangerous man that ever lived.
Walt Disney created the modern idea of theme parks. People can spend the whole day there.
Walt Disney created the modern idea of theme parks WHERE people can spend the whole day.
JK Rowling wrote the Harry Potter books and sold over 400 million copies.
The books encouraged millions of children to read.
JK Rowling wrote the Harry Potter books, which encouraged millions of children to read, and sold over 400 million copies.
OR
JK Rowling, whose books encouraged millions of children to read, wrote the Harry Potter books and sold over 400 million copies.
Leonardo Da Vinci was an artist and engineer. His helicopter design became a reality centuries later.
Leonardo Da Vinci was an artist and engineer WHOSE helicopter design became a reality centuries later.
Steve Jobs created many modern technological inventions including the iPad.
He was the Chief Executive of Apple.
Steve Jobs, who was the Chief Executive of Apple, created many modern technological inventions including the iPad.