Complex sentence: Haussknecht specialized in the study of the genus "Epilobium" from the botanical family Onagraceae, and in 1884 published a monograph on the genus called "Monographie der Gattung Epilobium".
Split into simpler sentences: Haussknecht specialized in the study of the genus "Epilobium" from the botanical family Onagraceae. In 1884 he published a monograph on the genus called "Monographie der Gattung Epilobium".