Complex sentence: In 2002, Tencent stopped its free membership registration, requiring all new members to pay a fee, but in 2003, this decision was reversed due to pressure from other instant messaging services such as Windows Live Messenger and Sina UC.
Split into simpler sentences: In 2002, Tencent stopped its free membership registration, requiring all new members to pay a fee. However, free registration was reopened in 2003 due to pressure from other instant messaging services such as Windows Live Messenger and Sina UC.