Just replace the double space with any sep character first:
txt<-"2013-08-13 19:26:58 Method for modifying a piece of 3D geometry
2013-08-13 19:26:57 Method of interactively modifying a feature"
read.table(sep="|",text=gsub(" ","|",txt), header=F)
# V1 V2
#1 2013-08-13 19:26:58 Method for modifying a piece of 3D geometry
#2 2013-08-13 19:26:57 Method of interactively modifying a feature