When he studied the microbial ribosomal RNAs (rRNA) it was found that many of them had distinctly different sequences from the normal bacteria rRNAs.
Oh look! I notice something, it seems like a lot of them have different sequences from the normal bacteria rRNAs.
Carl discovers archaebacteria or now called archaea
These look interesting. How about giving it a name. Hmmm... Oh! Archaebacteria would sound good!
He concluded that there are three divisions of living systems.
This means that there is a third life domain, or there are three divisions of living systems.
Carl says what the living systems are separated into.
These living systems are separated into: Bacteria, Archaea and Eukaryotes.
He describes what the different divisions of living systems are as a sign of declaring that there are now three divisions of living systems because of his discovery.
Bacterias are unicellular organisms. Archaeas are a group of micro-organisms that are similar to, but evolutionary distinct from bacteria. Eukaryotes are organisms whose cells have nucleus enclosed with a nuclear envelope.