Complex sentence: The species was later placed in the genus "Luscinia" but when a molecular phylogenetic study published in 2010 found that "Luscinia" was not monophyletic the genus was split and several species including the firethroat were moved to the reinstated genus "Calliope".
Split into simpler sentences: The species was later moved to the genus "Luscinia" but a molecular phylogenetic study published in 2010 found that "Luscinia" was not monophyletic. The genus was therefore split and several species including the firethroat were moved to the reinstated genus "Calliope".