Complex sentence: By now, the king was attracting public crowds wherever he traveled, and they had already gathered at the Vienna station the morning of August 5 when Kalākaua stepped off the train and was escorted by Austrian officials to the Hotel Imperial.
Split into simpler sentences: By now, the king was attracting public crowds wherever he traveled. Arriving at Vienna train station the morning of August 5, the crowds were there to greet him as he was escorted by Austrian officials to the Hotel Imperial.