Complex sentence: During and after that war the term "mine planter" became particularly associated with defensive coastal fortifications while the term "minelayer" applied to both defensive and offensive deployment of mine barrages and large scale sea mining.
Split into simpler sentences: During and after that war the term "mine planter" became particularly associated with defensive coastal fortifications. The term "minelayer" applied vessels deploying both defensive and offensive mine barrages and large scale sea mining.