[後「あと」]で => After V1, V2 N5
Time
恐らく => perhaps; likely; probably; I dare say ~ N2
〜がさいご(が最後) => if you do... negative result N1
Decisive (resolute decision)
たが[最後「さいご」] => Once A occurs, B happens N1
Information, Report
[恐「おそ」]れがある => There is a chance of A N2
Potential, Possibility
恐れがある => it is feared that; to be in danger of; to be liable to; possibility of; risk of ~ N2