import re
rx = r'/(\w +(?:\W +\w +)+\W *$)?'
strs = [ 'CENTRAL CARE HOSPITAL/HOPITAL CENTRALE DE SOINS' , 'ELEMENTARY/INSTITUTION' , 'FOUNDATION INSTITUTION/FUNDATION DEL INSTITUTO' , 'HAPPY SPRING BREAK 20/20' ]
for s in strs:
print ( re .sub ( rx, lambda x: "" if x.group ( 1 ) else " " , s) )
aW1wb3J0IHJlCnJ4ID0gcicvKFx3Kyg/OlxXK1x3KykrXFcqJCk/JwpzdHJzID0gWydDRU5UUkFMIENBUkUgSE9TUElUQUwvSE9QSVRBTCBDRU5UUkFMRSBERSBTT0lOUycsJ0VMRU1FTlRBUlkvSU5TVElUVVRJT04nLCdGT1VOREFUSU9OIElOU1RJVFVUSU9OL0ZVTkRBVElPTiBERUwgSU5TVElUVVRPJywnSEFQUFkgU1BSSU5HIEJSRUFLIDIwLzIwJ10KZm9yIHMgaW4gc3RyczoKCXByaW50KCByZS5zdWIocngsIGxhbWJkYSB4OiAiIiBpZiB4Lmdyb3VwKDEpIGVsc2UgIiAiLCBzKSApCg==