Complex sentence: Olivia (Anna Torv), reminded of Walter's past, contemplates if he may have written the plan down, and the Fringe team considers breaking into Walter's old lab at Harvard, which has been taken over as an Observer base.
Split into simpler sentences: Olivia (Anna Torv), reminded of Walter's past, contemplates if he may have written the plan down. The Fringe team considers breaking into Walter's old lab at Harvard, which has been taken over as an Observer base.