Complex sentence: Parliament may determine the number of members of the House of Representatives but the Constitution provides that this number must be "as nearly as practicable, twice the number of Senators"; this requirement is commonly called the "nexus provision".
Split into simpler sentences: Parliament may determine the number of members of the House of Representatives. However the Constitution provides that this number must be "as nearly as practicable, twice the number of Senators"; this requirement is commonly called the "nexus provision".