Complex sentence: Despite this she still did not use the sounds and in spontaneous speech, even though she had been imitating them since June 1972, and continued inconsistently using affricates in her spontaneous speech.
Split into simpler sentences: Despite this she still did not use the sounds and in spontaneous speech, even though she had been imitating them since June 1972. In addition, she continued inconsistently using affricates in her spontaneous speech.