Complex sentence: A deposit of $1000 is required for a candidate for the House of Representatives, and $2000 for a candidate for the Senate; this deposit is refunded if the candidate gains 4% of the first preference votes.
Split into simpler sentences: A deposit of $1000 is required for a candidate for the House of Representatives, and $2000 for a candidate for the Senate. This deposit is refunded if the candidate gains at least 4% of the first preference votes.