Complex sentence: At the oasis of Jericho, new wings of Herod's winter palace were uncovered, as was a Hasmonean (Maccabean) winter palace containing a number of swimming pools and gardens, which is the major archaeological site that has survived from that period in Jewish history.
Split into simpler sentences: At the oasis of Jericho, new wings of Herod's winter palace were uncovered, as was a Hasmonean (Maccabean) winter palace containing a number of swimming pools and gardens. This is the major archaeological site to have survived from that period in Jewish history.