old_contents: import warnings
  
  from ._version import get_versions
  
  __version__ = get_versions()["version"]
  del get_versions
  
  
  warnings.warn(
      "Importing this package as `import openforcefield.XXX` and "
      "`from openforcefield import XXX` was deprecated in version `0.8.3`. From version "
      "`0.9.0` onwards this package will need to be imported as "
      "`import openff.toolkit.XXX` and `from openff.toolkit import XXX`. See the `0.8.3` "
      "release notes for more information.",
      DeprecationWarning,
      stacklevel=2,
  )
  
new_contents: import warnings
  
  from ._version import get_versions
  
  __version__ = get_versions()["version"]
  del get_versions
  
  
  warnings.warn(
      "Importing this package as `import openforcefield.XXX` and "
      "`from openforcefield import XXX` was marked for deprecation in version `0.8.3`. From version "
      "`0.9.0` onwards this package will need to be imported as "
      "`import openff.toolkit.XXX` and `from openff.toolkit import XXX`. See the `0.8.3` "
      "release notes for more information.",
      DeprecationWarning,
      stacklevel=2,
  )
  
subject: Apply @jaimergp's re-wording suggestion.