Simplify the following text for a Grade 8 native English-speaking person.
Original: Robot anime like the Gundam and The Super Dimension Fortress Macross series became instant classics in the 1980s , and the robot genre of anime is still one of the most common in Japan and worldwide today .
Simplified: Robot anime like Gundam and Macross became classics in the 1980s . Today , the robot genre is still very popular in Japan and worldwide .