Complex sentence: It is also called "smallflower willowherb", however that name, in particular the British English variant "small-flowered willowherb", typically refers to "Epilobium parviflorum".
Split into simpler sentences: It is also called "smallflower willowherb". However that name, in particular the British English variant "small-flowered willowherb", typically refers to "Epilobium parviflorum".