Complex sentence: DEM L132a is 88 parsecs across and encompasses the two luminous blue variables S Doradus and R85, but those stars do not emit sufficient ionising radiation to produce the observed shell and no other hot luminous stars are seen within the shell.
Split into simpler sentences: DEM L132a is 88 parsecs across and encompasses the two luminous blue variables S Doradus and R85. However, those stars do not emit sufficient ionising radiation to produce the observed shell, and no other hot luminous stars are seen within the shell.