Complex sentence: Although her color palette was somewhat limited, her fellow impressionists regarded her as a "virtuoso colorist", typically she used white expansively as either a pure white, or mixed with other colors to obtain larger ranges of tone.
Split into simpler sentences: Although her color palette was somewhat limited, her fellow impressionists regarded her as a "virtuoso colorist". Morisot used white expansively as either a pure white, or mixed with other colors to obtain larger ranges of tone.