Simplify the following text for a Grade 5 native English-speaking person.
Original: In the same year , however , Cao personally laid a siege on LÃ 1\/4 Bu 's base in Xiapi , and defeated and captured LÃ 1\/4 .
Simplified: In the same year , however , Cao Cao himself came and attacked LÃ 1\/4 Bu 's base city , Xiapi .