Complex sentence: Departing Moscow in a lorry convey in December 1920, the family of five leave Russia with only that which they can carry, travelling first to Zilupe and then catching a train to Riga.
Split into simpler sentences: Departing Moscow in a lorry convey in December 1920, the family of five leave Russia with only that which they can carry. Travelling to Zilupe and then catching a train to Riga.