Simplify the following text for a Grade 10 native English-speaking person.
Original: The giant robot genre ( known as `` Mecha '' outside Japan ) , for instance , took shape under Tezuka , developed into the Super Robot genre under Go Nagai and others , and was revolutionized at the end of the decade by Yoshiyuki Tomino who developed the Real Robot genre .
Simplified: The giant robot genre ( known as `` mecha '' outside Japan ) began with manga and anime from Tezuka 's ideas .