Complex sentence: At around the same time Genie also began to produce ungrammatical sentences containing a copula, first with utterances such as "Is Akron" later to including verbs without the "-ing" suffix such as "Boy is pinch".
Split into simpler sentences: At around the same time, Genie also began to produce ungrammatical sentences containing a copula. At first they started off as utterances such as "Is Akron", and she later she began to include verbs in these sentences but did not add the "-ing" suffix to the end in utterances such as "Boy is pinch".