In South Africa, it has rapidly become dominant in the countrys coastal areas. With Post wires This is an important detail. So everybody should stay calm. But before we start worrying, we should first be clear about the details.
The research started before the middle of the 19th century.
( z0 start :ARG1 ( z1 research ) :time ( z2 before :op ( z3 middle :part-of ( z4 date-entity :century 19 ) ) ) )
(z0 / start-01
    :ARG1 (z1 / research-01)
    :time (z2 / before
              :op1 (z3 / middle
                       :part-of (z4 / date-entity
                                    :century 19))))
The research started before the middle of the 19th century .
z0 :ARG1 z1
z0 :time z2
z2 :op1 z3
z4 :century 0
z3 :part-of z4