Complex sentence: Second stay in Paris in 1954 and 1955 during which he meets Benjamin Péret and associates with the Surrealists, although he soon parts ways with the group in the company of his friend the painter Simon Hantaï.
Split into simpler sentences: Second stay in Paris in 1954 and 1955 during which he met Benjamin Péret and associated with the Surrealists, although he soon parted with the group. Joining instead in the company of his friend the painter Simon Hantaï.