The given sentence can be joined into a single simple sentence as follows: "Before my father taught me how to use the computer, I hadn't known how to use it.
A sentence can be defined as a group of words or phrases that comprises a subject and predicate, which are typically used by an author (writer) or speaker to convey a logical information about a subject matter to an audience (readers or listeners).
In English literature, there are four (4) main types of sentence and these include the following:
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Complete Question:
Join these 2 sentences into 1.
My father taught me how to use the computer. Before that, I didn't know how to use it.