Since the route has never seen any major redevelopment, it has grown haphazardly but organically over the centuries.
Because the route hasn't been majorly  developed, weeds had grown all over it.
mnli hypothesis: Because the route hasn't been majorly  developed, weeds had grown all over it. premise: Since the route has never seen any major redevelopment, it has grown haphazardly but organically over the centuries.