Complex sentence: The preterite (e.g. "I watched") has been completely replaced by the perfect (e.g. "I have watched"); the verb "wees" is again the only exception to this rule, which admits the preterite form "was".
Split into simpler sentences: The preterite (e.g. "I watched") has been completely replaced by the perfect (e.g. "I have watched"). Once again, the verb "wees" is the only exception to this rule, which admits the preterite form "was".