Simplify the following text for a Grade 4 native English-speaking person.
Original: Louis IV ( 10 September 920 â `` 30 September 954 ) , called d'Outremer or Transmarinus ( both meaning `` from overseas '' ) , reigned as King of Western Francia from 936 to 954 .
Simplified: Louis IV ( 920 â `` September 10 , 954 ) , was king of France from 936 to 954 .