Which transition should be used to combine these sentences? for example further to illustrate however

Student drivers are required to keep a log of their supervised driving hours. However, not all students are diligent in their record-keeping.

Explanation:

However is used to present us another statement that in some way contradicts something that was said in the previous one, partially or in the whole. In the given sentences in the first, it is claimed that students must keep a log of their supervised driving hours, yet in the second one there is a statement that not all students follow that rule. So, we have a contradiction between these two statements and using this transition we connect them accurately.