Okay it wasn't easy, but here is the code that should get that template give similar look as it in Oasis:
.hlist .toc {
padding-left: 5px;
}
.hlist .toc ul {
max-width: none;
}
.hlist .toc ul li {
margin-left: 0;
}
.hlist .toc ul li a {
display: inline;
padding: 0;
}
.hlist .toc li li:first-child:before {
content: "(";
}
.hlist .toc li li:last-child:after {
content: ")";
}
Put the code on MediaWiki:Fandomdesktop.css so it won't mess up Oasis.