One approach —
LD = load(websave('xydata','https://www.mathworks.com/matlabcentral/answers/uploaded_files/1171138/xydata.mat'));
T = LD.T;
TS = sortrows(T,1);
idx = [find([diff(TS.x)] > 100); size(T,1)];
s = diff([0; idx]);
C = mat2cell(table2array(TS), s, 2);
figure
hold on
for k = 1:numel(C)
plot(C{k}(:,1), C{k}(:,2))
end
hold off
xlabel('x')
ylabel('y')
.
