Complex sentence: Japan Standard Time or JST (日本標準時 or 中央標準時) is the standard timezone of Japan, and is 9 hours ahead of UTC; "ie" when it is midnight (00:00) in UTC, it is 9 am (09:00) in Japan Standard Time.
Split into simpler sentences: Japan Standard Time or JST (日本標準時 or 中央標準時) is the standard timezone of Japan, and is 9 hours ahead of UTC. For example, when it is midnight (00:00) in UTC, it is 9 am (09:00) in Japan Standard Time.