Japanese ports have been bustling with an increasing number of foreign cruise passengers amid robust demand for ship tours that has led to the development of new services combining a voyage with rail or air travel.
S Japanese ports
V [have been bustling] 賑っている
[with] (an increasing) number [of] foreign cruise passengers
[amid] robust demand [for] ship tours
S (ship tours)
V [has led]
[to] the development [of] new services
combining a voyage 船旅を組み合わせる
[with] rail [or] air travel.