在这种情况下，我会做类似的事情：

In this case I will do something like:

# Import raw data:
data_raw <- readLines("test.txt")

# find separation line:
id_sep <- which(data_raw=="")

# create ranges of both data sets:
data_1_range <- 4:(id_sep-1)
data_2_range <- (id_sep+4):length(data_raw)

# using ranges and row data import it:
data_1 <- read.csv(textConnection(data_raw[data_1_range]))
data_2 <- read.csv(textConnection(data_raw[data_2_range]))

实际上你的第一个示例集具有不一致的结构，所以 data_1 看起来很奇怪。

Actually your first example set has inconsistent structure so data_1 looks strange.