Complex sentence: Both Statutes were approved by the Catalan and Basque citizens through referendums with wide margins, complying with the procedure provided in article 151 of the Constitution for the "fast route" of accessing to autonomy, which allowed for an immediate assumption of full competences.
Split into simpler sentences: Both Statutes were approved by the Catalan and Basque citizens through referendums with wide margins. Both territories complied with the procedure provided in article 151 of Constitution for the "fast route" to accede to autonomy, which meant that regions acceding to autonomy status through this procedure were to immediatelly assume full competences.