refactoring: simplified return statement and removed unnecessary lines

src/main/py/read_math_function.py

@@ -114,5 +114,4 @@ def sum_of_simplified_exponential_functions(type, function):
     if type !="se":
         return False
     summands = function.split('+')
-    simplified = simplify_exponential_function('e', summands)
-    return simplified
+    return simplify_exponential_function('e', summands)