Complex sentence: While Martin occasionally visits Café Nervosa to see his sons, he dislikes its elaborate and expensive drinks and often visits a bar, McGinty's, with his best friend, the never-seen Duke.
Split into simpler sentences: While Martin occasionally visits Café Nervosa to see his sons, he dislikes its elaborate and expensive drinks. He prefers to spend time at a bar, McGinty's, with his best friend, the never-seen Duke.