# While he was speaking some people came from the leader of the synagogue

"While Jesus was speaking some people came from the house of the leader of the synagogue" or "some people from the synagogue leader's household came" 

# the leader of the synagogue

This refers to Jairus 

# Why trouble the teacher any longer?

"It is useless to bother the teacher any longer" or "There is no need to bother the teacher any longer." 

# the teacher

This refers to Jesus.