How do I remove a combinator from my style?

You don't. You apply a Descendant selector. These use a (Space).

By default all child selectors are Descendant selectors. These use a (Space). For this reason, if you have applied a different combinator, for example, an Adjacent sibling (+),  you can remove it by re-applying the Descendent selector (Space).

For more information, see Using combinators.