Complex sentence: Donatas Malinauskas, Stanisław Narutowicz, Jonas Smilgevičius, and Mykolas Biržiška; the other 16 were the children of farmers.
Split into simpler sentences: Donatas Malinauskas, Stanisław Narutowicz, Jonas Smilgevičius, and Mykolas Biržiška. The other 16 were the children of farmers.