Complex sentence: Her last voyage began on 7 September 1853 from Manila to London, but heavy storms forced a return to Manila, and after re-caulking, she sailed again on 23 September 1853to London via Melbourne.
Split into simpler sentences: Her last voyage began on 7 September 1853, when she left from Manila to London, but heavy storms forced a return to Manila. After re-caulking, she sailed again on 23 September 1853 to London via Melbourne.