Original sentence: Before the presidential crisis of 2019, Maduro has requested and received foreign aid in 2018; in particular, it requested help from UN to help deal with sanctions issued by the United States to receive medical equipment and supplies
Edited sentence: Before the presidential crisis of 2019, Maduro has requested and received foreign aid in 2018; in particular, it requested help from UN to help deal with blockades imposed by the United States to receive medical equipment and supplies