# set the temple in order

"restored proper worship to the temple" 

# Necho, king of Egypt, went up

"Necho, king of Egypt, went up with his army"

# against Carchemish

"against the people of Carchemish". This is the name of a city.   

# Josiah went to fight against him

"Josiah and his army went to fight against Necho and his army"