Complex sentence: In 1963, Ambler published the first amino acid sequence of a bacterial protein, developing new methods of protein sequencing to determine the structure of the mitochondrial cytochrome "c" protein, which remains an important object of study for modern biologists.
Split into simpler sentences: In 1963, Ambler published the first amino acid sequence of a bacterial protein, developing new methods of protein sequencing to determine the structure of the mitochondrial cytochrome "c" protein. Cytochrome "c" remains an important object of study for modern biologists.