\begin{tikzpicture}
\begin{umlcomponent}{A}
\umlbasiccomponent{B}
\umlbasiccomponent[y=-2]{C}
\end{umlcomponent}
\umlbasiccomponent[x=-10,y=1]{D}
\umlbasiccomponent[x=3,y=-7.5]{E}
\umlbasiccomponent[x=-2, y=-9]{F}
\umlbasiccomponent[x=-7,y=-8]{G}
\umlbasiccomponent[x=-7,y=-11]{H}
\end{tikzpicture}