Traditional Chinese characters are currently used in Taiwan (Republic of China), Hong Kong and Macau. They were also used in mainland China before the People's Republic of China simplified them in the 1950s and 1960s.

Some traditional character users argue that traditional characters are the original form of the Chinese characters and cannot be called "complex". Similarly, simplified characters cannot be "standard" because they are not used in all Chinese-speaking regions. Conversely, supporters of simplified Chinese characters object to the description of traditional characters as "standard," since they view the new simplified characters as the contemporary standard used by the vast majority of Chinese speakers. They also point out that traditional characters are not truly traditional as many Chinese characters have been made more elaborate over time.

source: wikipedia