Complex sentence: The dessert its self is made of a liqueur-sprinkled sponge cake that has jam spread on it then is then topped with whipped cream and sprinkled with nuts part of the presentation is that the Dessert is surrounded by a small amount of custard.
Split into simpler sentences: The dessert itself is made of a liqueur-sprinkled sponge cake spread with jam, topped with whipped cream and sprinkled with nuts. Part of the presentation is that the dessert is surrounded by a small amount of custard.