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It looks like you should:

sage: import_statements(RootSystem)
from sage.combinat.root_system.root_system import RootSystem


It looks like you should:

sage: import_statements(RootSystem)
from sage.combinat.root_system.root_system import RootSystem


As you can see in the documentation of import_statements, it tries to find out from where the symbol requested should be imported and returns a string that describes a command to do that import. So, in your case, it suggests to use

from sage.combinat.root_system.root_system import RootSystem