Complex sentence: The soundings revealed a conical shape for the lake bed, which is consistent with an impact crater and the lake's long axis points to the epicenter of the Tunguska explosion, about 7.0 km away.
Split into simpler sentences: The soundings revealed a conical shape for the lake bed, which is consistent with an impact crater. Finally, the lake's long axis points to the epicenter of the Tunguska explosion, about 7.0 km away.