Complex sentence: Since these observations are consistent thus these dates are commonly regarded as most authentic.Thus we no more have to rely on archaeological findings (which were impossible to trace after nearly 7000 years since the birth of Rama).
Split into simpler sentences: Since these observations are consistent thus these dates are commonly regarded as most authentic. We no more have to rely on archaeological findings (which were impossible to trace after nearly 7000 years since the birth of Rama).