Original sentence: This percentage was enough to win the presidency outright as a result of a change in electoral law which lowered the percentage necessary to avoid a runoff election from 45% to 35% (with a 5% margin of victory)
Edited sentence: This percentage was enough to win the presidency outright as a result of the well-known "Pacto Alemán-Ortega", which lowered the percentage necessary to avoid a runoff election from 45% to 35% (with a 5% margin of victory)