Elderly people are not able to move ahead with the secondary evacuation plans because they don't want to go too far from their homes.
The government is having difficulty proceeding with secondary evacuation plans because old people don't want to leave their hometown.
この場合の「二次避難が進まない」は、次のような言い方ができますよ。
高齢者を主語にして言う場合
ーElderly people are not able to move ahead with the secondary evacuation plans because they don't want to go too far from their homes.
「高齢者は家からあまり遠くに行きたくないので、二次避難の計画を進めることができない」
行政を主語にして言う場合
ーThe government is having difficulty proceeding with secondary evacuation plans because old people don't want to leave their hometown.
「お年寄りが故郷を離れたがらないので、行政は二次避難を進めるのに苦労している」
ご参考まで！
カナダ 
