Processing morphemic elements is one of the most difficult parts of second language acquisition (DeKeyser, 2005; Larsen-Freeman, 2010). This difficulty gains prominence when second language (L2) learners must perform under time pressure, and difficulties arise in using grammatical knowledge. To solve the problem, the current study used the tenets of multimedia learning theory (Mayer, 2005) to help L2 learners' reconstruct multiclausal sentences. This theory assumes that limitations in cognitive capacity are reduced when information is given to learners both visually and aurally. Given this assumption, the current study examined whether pictorial information helps L2 learners process morphemic elements in multiclausal sentences presented aurally. Thirty-two learners of Japanese engaged in elicited imitation both with and without pictorial support. The results revealed that the learners performed significantly better with pictorial support, lending support to multimedia learning theory for L2 learners' processing of morphemic elements. However, a limited effect of pictorial support was found for the processing of an element that the L2 learners had learned recently, and that was in sentence-final position, suggesting that these types of items are difficult to automatize regardless of cognitive support.