Simplify the following text for a Grade 4 native English-speaking person.
Original: He is regarded as one of the four haiku masters in Japan , along with BashÅ , Buson and Shiki - ` the Great Four , Basho , Buson , Issa , Shiki ' .
Simplified: He is thought of as one of the four haiku masters in Japan . The others are BashÅ , Buson and Shiki .