Code:
$ cat infile
geometry,geometry_vertex_count,Id,strnum,platecode,datatype,dtnum,refnum,appearance,disappeara,color,geogdesc,datatype_ft_style,import_notes
"<LineString><coordinates>-130.6539,51.5103,0
-130.7708,51.6287,0
-130.8356,51.6832,0
-130.9211,51.7772,0
-130.9982,51.8414,0
-130.4732,51.3662,0
-130.5872,51.4701,0
-130.6539,51.5103,0</coordinates></LineString>",49,,413,101,TR,1,9829,10.000000,-999.000000,1,TRENCH
BET
JUAN
DE
FUCA
&
N.
AMERICA,0,
"<LineString><coordinates>-106.4797,21.2508,0
-106.4726,21.1354,0
-106.4749,21.0526,0
$ sed -e 's/^[^-].*$/>>/' infile
>>
>>
-130.7708,51.6287,0
-130.8356,51.6832,0
-130.9211,51.7772,0
-130.9982,51.8414,0
-130.4732,51.3662,0
-130.5872,51.4701,0
-130.6539,51.5103,0</coordinates></LineString>",49,,413,101,TR,1,9829,10.000000,-999.000000,1,TRENCH
>>
>>
>>
>>
>>
>>
>>
>>
-106.4726,21.1354,0
-106.4749,21.0526,0