Complex sentence: In a modern-time re-enactment of the Pasteur experiment it was established that the preparation of crystals was not very reproducible, the crystals deformed but that the crystals were large enough to inspect with the naked eye (microscope not required).
Split into simpler sentences: In a modern-time re-enactment of the Pasteur experiment, it was established that the preparation of crystals was not very reproducible. The crystals deformed, but they were large enough to inspect with the naked eye (microscope not required).