Complex sentence: The level of reading was not determined from the speed, rather from the fact that the patient was not able to read more than 62 of the stimuli presented in three minutes, while 40% of the represented stimuli were either read incorrectly or left unread.
Split into simpler sentences: The level of reading was not determined from the speed, rather from the fact that the patient was not able to read more than 62 of the stimuli presented in three minutes. Additionally, 40% of the represented stimuli were read incorrectly or left unread.