Complex sentence: On March 20,2015 the rules for disclosing the chemicals used were tightened by the Oboma administration giving the companies involved 30 days from the beginning of an operation on federal land to disclose those chemicals.
Split into simpler sentences: On March 20,2015 the rules for disclosing the chemicals used were tightened by the Obama administration. The new rules give companies involved 30 days from the beginning of an operation on federal land to disclose those chemicals.