Complex sentence: It was originally a system of regular verbs, and in Old English and modern German the system remains more or less regular; however in Modern English relatively few verbs continue to follow such a pattern, and they are classed as irregular.
Split into simpler sentences: It was originally a system of regular verbs, and in Old English and modern German the system remains more or less regular. However in Modern English relatively few verbs continue to follow such a pattern, and they are classed as irregular.