Complex sentence: A culture of "Ralstonia eutropha" tolerant of electricity is kept within the H 2 O and CO 2 mixture and converts formic acid to isobutanol.
Split into simpler sentences: A culture of "Ralstonia eutropha" (composed of a strain tolerant to electricity) is kept within the H 2 O and CO 2 mixture. The culture of "Ralstonia eutropha" then converts formic acid to isobutanol.