Where does “Supplementsatz” come from?

Supplementsatz (German) comes from German Satz, from Middle High German saz, from Middle High German setzen, from Old High German sezzen, from Proto-West Germanic *sattjan, from Proto-Germanic satjaną, from Proto-Indo-European sodéyeti, from Proto-Indo-European -éyeti — Creates transitive imperfective verbs from roots.

Ancestry of “Supplementsatz”, step by step

Supplementsatz traces back through two separate lines of ancestry.

via German Satz

StepLanguageWordMeaning
1GermanSatzsentence; proposition, theorem; set
2Middle High Germansaz
3Middle High Germansetzento set, place down
4Old High Germansezzento make sit, set, put
5Proto-West Germanic*sattjanto set, place
6Proto-Germanicsatjanąto set, to place down
7Proto-Indo-Europeansodéyetito set, to seat, to cause to sit
8Proto-Indo-European-éyetiForms causative imperfective verbs from roots;...
9Proto-Indo-European-yetiCreates transitive imperfective verbs from roots

via German Supplement

StepLanguageWordMeaning
1GermanSupplementsupplement addition to a printed work
2EnglishsupplementSomething added, especially to make up for a...
3Latinsupplementumsomething that fills up or makes up the numbers;...
4LatinsuppleoI make up the numbers, fill up, complete, make...
5Latinsub-under, sub
6Proto-Indo-Europeanupóunder, below
7Proto-Indo-Europeanh₃ewp-
Every word from Proto-Indo-European -yeti