Complex sentence: Surprisingly, there is an absence of H I in the inner regions of the galaxy unless the physical conditions of the ISM of NGC 4476 are very different from those of typical Virgo Cluster spirals.
Split into simpler sentences: Surprisingly, there is an absence of H I in the inner regions of the galaxy. This possibly suggests that the physical conditions of the ISM of NGC 4476 are very different from those of typical Virgo Cluster spirals.