Complex sentence: After 3 weeks, the Sevastopol was still afloat, having survived 124 torpedoes, and having sunk 2 Japanese destroyers and damaging 6 others; the Japanese had meanwhile also lost the "Takasago" to a mine outside the harbor.
Split into simpler sentences: After 3 weeks, the "Sevastopol" was still afloat, having survived 124 torpedoes and having sunk two Japanese destroyers and damaged six others. The Japanese had meanwhile lost the cruiser "Takasago" to a mine outside the harbor.