造船 means "to build ships". It's a separable verb (离合词): the verb 造 and the object 船 can split apart when duration, frequency, or resultative complements appear between them — e.g. 造了三年的船 (built ships for three years) or 造出新的船 (produced new ships). You can also insert 了, 过, or measure words like 一次 between the two parts. The object 船 can also be modified: 造一艘大船 (build a big ship).