Complex sentence: This survey produced spectra of a far higher resolution than ECAS, and was able to resolve a variety of narrow spectral features, but a somewhat smaller range of wavelengths (0.44μm to 0.92μm) was observed.
Split into simpler sentences: This survey produced spectra of a far higher resolution than ECAS, and was able to resolve a variety of narrow spectral features. However, a somewhat smaller range of wavelengths (0.44μm to 0.92μm) was observed.