Complex sentence: Leo Baxendale drew it until 1962, when David Sutherland replaced him, initially using a similar drawing style to Baxendale, but simplifying it later in the decade.
Split into simpler sentences: Leo Baxendale drew the strip until 1962, when David Sutherland replaced him. Sutherland originally used a similar drawing style to Baxendale's, simplifying it later in the decade.